1557319739220 has 360 divisors, whose sum is σ = 5769235688832. Its totient is φ = 344473845120.

The previous prime is 1557319739191. The next prime is 1557319739221. The reversal of 1557319739220 is 229379137551.

It is a happy number.

1557319739220 is a `hidden beast` number, since 1 + 5 + 573 + 19 + 7 + 39 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557319739221) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 10826289 + ... + 10969191.

Almost surely, 2^{1557319739220} is an apocalyptic number.

1557319739220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557319739220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2884617844416).

1557319739220 is an abundant number, since it is smaller than the sum of its proper divisors (4211915949612).

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

1557319739220 is a wasteful number, since it uses less digits than its factorization.

1557319739220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142993 (or 142951 counting only the distinct ones).

The product of its (nonzero) digits is 3572100, while the sum is 54.

The spelling of 1557319739220 in words is "one trillion, five hundred fifty-seven billion, three hundred nineteen million, seven hundred thirty-nine thousand, two hundred twenty".