72666664503 has 4 divisors (see below), whose sum is σ = 96888886008. Its totient is φ = 48444443000.

The previous prime is 72666664493. The next prime is 72666664507. The reversal of 72666664503 is 30546666627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30546666627 = 3 ⋅10182222209.

It is a cyclic number.

It is not a de Polignac number, because 72666664503 - 2⁹ = 72666663991 is a prime.

It is a super-4 number, since 4×72666664503⁴ (a number of 45 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72666664507) 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 3 ways as a sum of consecutive naturals, for example, 12111110748 + ... + 12111110753.

It is an arithmetic number, because the mean of its divisors is an integer number (24222221502).

Almost surely, 2^72666664503 is an apocalyptic number.

72666664503 is a deficient number, since it is larger than the sum of its proper divisors (24222221505).

72666664503 is a wasteful number, since it uses less digits than its factorization.

72666664503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24222221504.

The product of its (nonzero) digits is 6531840, while the sum is 51.

The spelling of 72666664503 in words is "seventy-two billion, six hundred sixty-six million, six hundred sixty-four thousand, five hundred three".