2157666860026 has 32 divisors (see below), whose sum is σ = 3281396152320. Its totient is φ = 1063957160304.

The previous prime is 2157666859981. The next prime is 2157666860029. The reversal of 2157666860026 is 6200686667512.

It is not an unprimeable number, because it can be changed into a prime (2157666860029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301388635 + ... + 301395793.

It is an arithmetic number, because the mean of its divisors is an integer number (102543629760).

Almost surely, 2^{2157666860026} is an apocalyptic number.

2157666860026 is a deficient number, since it is larger than the sum of its proper divisors (1123729292294).

2157666860026 is a wasteful number, since it uses less digits than its factorization.

2157666860026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13090.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 2157666860026 in words is "two trillion, one hundred fifty-seven billion, six hundred sixty-six million, eight hundred sixty thousand, twenty-six".