66951633957 has 32 divisors (see below), whose sum is σ = 99484627200. Its totient is φ = 39766712832.

The previous prime is 66951633913. The next prime is 66951633967. The reversal of 66951633957 is 75933615966.

66951633957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66951633957 - 2⁶ = 66951633893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66951633957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66951633907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4016913 + ... + 4033545.

It is an arithmetic number, because the mean of its divisors is an integer number (3108894600).

Almost surely, 2^66951633957 is an apocalyptic number.

It is an amenable number.

66951633957 is a deficient number, since it is larger than the sum of its proper divisors (32532993243).

66951633957 is a wasteful number, since it uses less digits than its factorization.

66951633957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20237.

The product of its digits is 27556200, while the sum is 60.

The spelling of 66951633957 in words is "sixty-six billion, nine hundred fifty-one million, six hundred thirty-three thousand, nine hundred fifty-seven".