1661357530 has 32 divisors (see below), whose sum is σ = 3597528960. Its totient is φ = 539628480.

The previous prime is 1661357513. The next prime is 1661357543. The reversal of 1661357530 is 357531661.

It is a self number, because there is not a number n which added to its sum of digits gives 1661357530.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623241 + ... + 625900.

It is an arithmetic number, because the mean of its divisors is an integer number (112422780).

Almost surely, 2^1661357530 is an apocalyptic number.

1661357530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661357530 is an abundant number, since it is smaller than the sum of its proper divisors (1936171430).

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

1661357530 is a wasteful number, since it uses less digits than its factorization.

1661357530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249174.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 1661357530 is about 40759.7538020043. The cubic root of 1661357530 is about 1184.3708268430.

The spelling of 1661357530 in words is "one billion, six hundred sixty-one million, three hundred fifty-seven thousand, five hundred thirty".