715129643421 has 24 divisors (see below), whose sum is σ = 1096100309304. Its totient is φ = 447735413760.

The previous prime is 715129643411. The next prime is 715129643471. The reversal of 715129643421 is 124346921517.

715129643421 is a `hidden beast` number, since 7 + 1 + 512 + 96 + 4 + 3 + 42 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 201793217796 + 513336425625 = 449214^2 + 716475^2 .

It is not a de Polignac number, because 715129643421 - 2¹⁰ = 715129642397 is a prime.

It is a super-2 number, since 2×715129643421² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (715129643411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4998936 + ... + 5140001.

It is an arithmetic number, because the mean of its divisors is an integer number (45670846221).

Almost surely, 2^715129643421 is an apocalyptic number.

It is an amenable number.

715129643421 is a deficient number, since it is larger than the sum of its proper divisors (380970665883).

715129643421 is a wasteful number, since it uses less digits than its factorization.

715129643421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139421 (or 10139418 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 715129643421 in words is "seven hundred fifteen billion, one hundred twenty-nine million, six hundred forty-three thousand, four hundred twenty-one".