801424637721 has 6 divisors (see below), whose sum is σ = 1157613365610. Its totient is φ = 534283091808.

The previous prime is 801424637683. The next prime is 801424637737. The reversal of 801424637721 is 127736424108.

801424637721 is a `hidden beast` number, since 8 + 0 + 1 + 4 + 2 + 4 + 637 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 666174278025 + 135250359696 = 816195^2 + 367764^2 .

It is not a de Polignac number, because 801424637721 - 2²⁶ = 801357528857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (801424637771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44523590976 + ... + 44523590993.

It is an arithmetic number, because the mean of its divisors is an integer number (192935560935).

Almost surely, 2^801424637721 is an apocalyptic number.

It is an amenable number.

801424637721 is a deficient number, since it is larger than the sum of its proper divisors (356188727889).

801424637721 is a wasteful number, since it uses less digits than its factorization.

801424637721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89047181975 (or 89047181972 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 801424637721 in words is "eight hundred one billion, four hundred twenty-four million, six hundred thirty-seven thousand, seven hundred twenty-one".