2157664863002 has 16 divisors (see below), whose sum is σ = 3533484902400. Its totient is φ = 979989927840.

The previous prime is 2157664862981. The next prime is 2157664863007. The reversal of 2157664863002 is 2003684667512.

It is a happy number.

It is a super-2 number, since 2×2157664863002² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157664863007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38312627 + ... + 38368902.

It is an arithmetic number, because the mean of its divisors is an integer number (220842806400).

Almost surely, 2^{2157664863002} is an apocalyptic number.

2157664863002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2157664863002 is a deficient number, since it is larger than the sum of its proper divisors (1375820039398).

2157664863002 is a wasteful number, since it uses less digits than its factorization.

2157664863002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76682821.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 2157664863002 in words is "two trillion, one hundred fifty-seven billion, six hundred sixty-four million, eight hundred sixty-three thousand, two".