1657168138 has 4 divisors (see below), whose sum is σ = 2485752210. Its totient is φ = 828584068.

The previous prime is 1657168103. The next prime is 1657168169. The reversal of 1657168138 is 8318617561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1514532889 + 142635249 = 38917^2 + 11943^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414292033 + ... + 414292036.

Almost surely, 2^1657168138 is an apocalyptic number.

1657168138 is a deficient number, since it is larger than the sum of its proper divisors (828584072).

1657168138 is an equidigital number, since it uses as much as digits as its factorization.

1657168138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828584071.

The product of its digits is 241920, while the sum is 46.

The square root of 1657168138 is about 40708.3300812008. The cubic root of 1657168138 is about 1183.3744588938.

The spelling of 1657168138 in words is "one billion, six hundred fifty-seven million, one hundred sixty-eight thousand, one hundred thirty-eight".