66956970951 has 20 divisors (see below), whose sum is σ = 107716154392. Its totient is φ = 41204289168.

The previous prime is 66956970929. The next prime is 66956970989. The reversal of 66956970951 is 15907965966.

66956970951 is a `hidden beast` number, since 6 + 69 + 569 + 7 + 0 + 9 + 5 + 1 = 666.

It is not a de Polignac number, because 66956970951 - 2¹⁰ = 66956969927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66956970901) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31792381 + ... + 31794486.

Almost surely, 2^66956970951 is an apocalyptic number.

66956970951 is a deficient number, since it is larger than the sum of its proper divisors (40759183441).

66956970951 is a wasteful number, since it uses less digits than its factorization.

66956970951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63586892 (or 63586883 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 63.

The spelling of 66956970951 in words is "sixty-six billion, nine hundred fifty-six million, nine hundred seventy thousand, nine hundred fifty-one".