1657855987879 has 48 divisors (see below), whose sum is σ = 2126764176768. Its totient is φ = 1280351052288.

The previous prime is 1657855987847. The next prime is 1657855987889. The reversal of 1657855987879 is 9787895587561.

It is not a de Polignac number, because 1657855987879 - 2⁵ = 1657855987847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1657855987796 and 1657855987805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657855987889) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11093019 + ... + 11241475.

It is an arithmetic number, because the mean of its divisors is an integer number (44307587016).

Almost surely, 2^{1657855987879} is an apocalyptic number.

1657855987879 is a deficient number, since it is larger than the sum of its proper divisors (468908188889).

1657855987879 is a wasteful number, since it uses less digits than its factorization.

1657855987879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148904 (or 148897 counting only the distinct ones).

The product of its digits is 10668672000, while the sum is 85.

The spelling of 1657855987879 in words is "one trillion, six hundred fifty-seven billion, eight hundred fifty-five million, nine hundred eighty-seven thousand, eight hundred seventy-nine".