66672793940 has 24 divisors (see below), whose sum is σ = 144840898440. Its totient is φ = 25749492608.

The previous prime is 66672793931. The next prime is 66672793991. The reversal of 66672793940 is 4939727666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20483906884 + 46188887056 = 143122^2 + 214916^2 .

It is a super-2 number, since 2×66672793940² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66672793940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57475967 + ... + 57477126.

It is an arithmetic number, because the mean of its divisors is an integer number (6035037435).

Almost surely, 2^66672793940 is an apocalyptic number.

It is an amenable number.

66672793940 is an abundant number, since it is smaller than the sum of its proper divisors (78168104500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66672793940 is a wasteful number, since it uses less digits than its factorization.

66672793940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114953131 (or 114953129 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 59.

The spelling of 66672793940 in words is "sixty-six billion, six hundred seventy-two million, seven hundred ninety-three thousand, nine hundred forty".