72663026431 has 4 divisors (see below), whose sum is σ = 72664624864. Its totient is φ = 72661428000.

The previous prime is 72663026419. The next prime is 72663026453. The reversal of 72663026431 is 13462036627.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72663026431 - 2⁵ = 72663026399 is a prime.

It is a super-2 number, since 2×72663026431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72663026731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728970 + ... + 822631.

It is an arithmetic number, because the mean of its divisors is an integer number (18166156216).

Almost surely, 2^72663026431 is an apocalyptic number.

72663026431 is a deficient number, since it is larger than the sum of its proper divisors (1598433).

72663026431 is a wasteful number, since it uses less digits than its factorization.

72663026431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598432.

The product of its (nonzero) digits is 217728, while the sum is 40.

The spelling of 72663026431 in words is "seventy-two billion, six hundred sixty-three million, twenty-six thousand, four hundred thirty-one".