1557166051 has 24 divisors (see below), whose sum is σ = 1936677600. Its totient is φ = 1243936512.

The previous prime is 1557166003. The next prime is 1557166063. The reversal of 1557166051 is 1506617551.

It is not a de Polignac number, because 1557166051 - 2²³ = 1548777443 is a prime.

It is a super-2 number, since 2×1557166051² = 4849532220773869202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557166051.

It is not an unprimeable number, because it can be changed into a prime (1557166081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76725 + ... + 94873.

It is an arithmetic number, because the mean of its divisors is an integer number (80694900).

Almost surely, 2^1557166051 is an apocalyptic number.

1557166051 is a deficient number, since it is larger than the sum of its proper divisors (379511549).

1557166051 is a wasteful number, since it uses less digits than its factorization.

1557166051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18283 (or 18276 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 37.

The square root of 1557166051 is about 39460.9433617596. The cubic root of 1557166051 is about 1159.0752764554.

The spelling of 1557166051 in words is "one billion, five hundred fifty-seven million, one hundred sixty-six thousand, fifty-one".