88640669021 has 2 divisors, whose sum is σ = 88640669022. Its totient is φ = 88640669020.

The previous prime is 88640669003. The next prime is 88640669057. The reversal of 88640669021 is 12096604688.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67727460025 + 20913208996 = 260245^2 + 144614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88640669021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88640609021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44320334510 + 44320334511.

It is an arithmetic number, because the mean of its divisors is an integer number (44320334511).

Almost surely, 2^88640669021 is an apocalyptic number.

It is an amenable number.

88640669021 is a deficient number, since it is larger than the sum of its proper divisors (1).

88640669021 is an equidigital number, since it uses as much as digits as its factorization.

88640669021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 88640669021 in words is "eighty-eight billion, six hundred forty million, six hundred sixty-nine thousand, twenty-one".