1557745530 has 96 divisors (see below), whose sum is σ = 4351257792. Its totient is φ = 355407360.

The previous prime is 1557745507. The next prime is 1557745537. The reversal of 1557745530 is 355477551.

1557745530 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1557745530² = 4853142272469961800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1557745537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49089 + ... + 74331.

It is an arithmetic number, because the mean of its divisors is an integer number (45325602).

Almost surely, 2^1557745530 is an apocalyptic number.

1557745530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557745530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2175628896).

1557745530 is an abundant number, since it is smaller than the sum of its proper divisors (2793512262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1557745530 is a wasteful number, since it uses less digits than its factorization.

1557745530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25292 (or 25281 counting only the distinct ones).

The product of its (nonzero) digits is 367500, while the sum is 42.

The square root of 1557745530 is about 39468.2851160270. The cubic root of 1557745530 is about 1159.2190368640.

The spelling of 1557745530 in words is "one billion, five hundred fifty-seven million, seven hundred forty-five thousand, five hundred thirty".