2157936451657 has 16 divisors (see below), whose sum is σ = 2489651066880. Its totient is φ = 1832140424448.

The previous prime is 2157936451577. The next prime is 2157936451663. The reversal of 2157936451657 is 7561546397512.

It is a cyclic number.

It is not a de Polignac number, because 2157936451657 - 2³⁹ = 1608180637769 is a prime.

It is a super-3 number, since 3×2157936451657³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2157936451595 and 2157936451604.

It is not an unprimeable number, because it can be changed into a prime (2157936451157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2023657 + ... + 2900182.

It is an arithmetic number, because the mean of its divisors is an integer number (155603191680).

Almost surely, 2^{2157936451657} is an apocalyptic number.

It is an amenable number.

2157936451657 is a deficient number, since it is larger than the sum of its proper divisors (331714615223).

2157936451657 is a wasteful number, since it uses less digits than its factorization.

2157936451657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924440.

The product of its digits is 47628000, while the sum is 61.

The spelling of 2157936451657 in words is "two trillion, one hundred fifty-seven billion, nine hundred thirty-six million, four hundred fifty-one thousand, six hundred fifty-seven".