879641502921 has 10 divisors (see below), whose sum is σ = 1314032368682. Its totient is φ = 586427668560.

The previous prime is 879641502919. The next prime is 879641502931. The reversal of 879641502921 is 129205146978.

It is a happy number.

879641502921 is a `hidden beast` number, since 8 + 7 + 9 + 6 + 41 + 502 + 92 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 773231800896 + 106409702025 = 879336^2 + 326205^2 .

It is not a de Polignac number, because 879641502921 - 2¹ = 879641502919 is a prime.

It is a super-2 number, since 2×879641502921² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (879641502931) 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 9 ways as a sum of consecutive naturals, for example, 5429885740 + ... + 5429885901.

Almost surely, 2^879641502921 is an apocalyptic number.

879641502921 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

879641502921 is a deficient number, since it is larger than the sum of its proper divisors (434390865761).

879641502921 is a wasteful number, since it uses less digits than its factorization.

879641502921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10859771653 (or 10859771644 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 879641502921 in words is "eight hundred seventy-nine billion, six hundred forty-one million, five hundred two thousand, nine hundred twenty-one".