1657115889 has 16 divisors (see below), whose sum is σ = 2595762624. Its totient is φ = 927057600.

The previous prime is 1657115879. The next prime is 1657115909. The reversal of 1657115889 is 9885117561.

It is a de Polignac number, because none of the positive numbers 2^k-1657115889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1657115879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1930942 + ... + 1931799.

It is an arithmetic number, because the mean of its divisors is an integer number (162235164).

Almost surely, 2^1657115889 is an apocalyptic number.

It is an amenable number.

1657115889 is a deficient number, since it is larger than the sum of its proper divisors (938646735).

1657115889 is a wasteful number, since it uses less digits than its factorization.

1657115889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862768.

The product of its digits is 604800, while the sum is 51.

The square root of 1657115889 is about 40707.6883278822. The cubic root of 1657115889 is about 1183.3620218573.

The spelling of 1657115889 in words is "one billion, six hundred fifty-seven million, one hundred fifteen thousand, eight hundred eighty-nine".