66612872031 has 16 divisors (see below), whose sum is σ = 89133965184. Its totient is φ = 44250296544.

The previous prime is 66612871987. The next prime is 66612872069. The reversal of 66612872031 is 13027821666.

It is not a de Polignac number, because 66612872031 - 2¹⁸ = 66612609887 is a prime.

It is a super-2 number, since 2×66612872031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66612872071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2538480 + ... + 2564586.

It is an arithmetic number, because the mean of its divisors is an integer number (5570872824).

Almost surely, 2^66612872031 is an apocalyptic number.

66612872031 is a deficient number, since it is larger than the sum of its proper divisors (22521093153).

66612872031 is a wasteful number, since it uses less digits than its factorization.

66612872031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29110.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 66612872031 in words is "sixty-six billion, six hundred twelve million, eight hundred seventy-two thousand, thirty-one".