66653660031 has 64 divisors (see below), whose sum is σ = 106140672000. Its totient is φ = 36413919360.

The previous prime is 66653659981. The next prime is 66653660041. The reversal of 66653660031 is 13006635666.

It is not a de Polignac number, because 66653660031 - 2¹³ = 66653651839 is a prime.

It is a super-2 number, since 2×66653660031² (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 (66653660041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23880246 + ... + 23883036.

It is an arithmetic number, because the mean of its divisors is an integer number (1658448000).

Almost surely, 2^66653660031 is an apocalyptic number.

66653660031 is a deficient number, since it is larger than the sum of its proper divisors (39487011969).

66653660031 is a wasteful number, since it uses less digits than its factorization.

66653660031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396.

The product of its (nonzero) digits is 349920, while the sum is 42.

The spelling of 66653660031 in words is "sixty-six billion, six hundred fifty-three million, six hundred sixty thousand, thirty-one".