1657337978231 has 16 divisors (see below), whose sum is σ = 1795572055200. Its totient is φ = 1529692429824.

The previous prime is 1657337978227. The next prime is 1657337978243. The reversal of 1657337978231 is 1328797337561.

It is a happy number.

It is not a de Polignac number, because 1657337978231 - 2² = 1657337978227 is a prime.

It is a super-2 number, since 2×1657337978231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657337978221) 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, 24856520 + ... + 24923106.

It is an arithmetic number, because the mean of its divisors is an integer number (112223253450).

Almost surely, 2^{1657337978231} is an apocalyptic number.

1657337978231 is a deficient number, since it is larger than the sum of its proper divisors (138234076969).

1657337978231 is an equidigital number, since it uses as much as digits as its factorization.

1657337978231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77955 (or 77929 counting only the distinct ones).

The product of its digits is 40007520, while the sum is 62.

The spelling of 1657337978231 in words is "one trillion, six hundred fifty-seven billion, three hundred thirty-seven million, nine hundred seventy-eight thousand, two hundred thirty-one".