66513596412951 has 24 divisors (see below), whose sum is σ = 101950594345600. Its totient is φ = 43311179052792.

The previous prime is 66513596412877. The next prime is 66513596412953. The reversal of 66513596412951 is 15921469531566.

66513596412951 is a `hidden beast` number, since 6 + 6 + 5 + 13 + 596 + 4 + 1 + 29 + 5 + 1 = 666.

It is not a de Polignac number, because 66513596412951 - 2¹⁴ = 66513596396567 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 (66513596412953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3182762851 + ... + 3182783748.

Almost surely, 2^{66513596412951} is an apocalyptic number.

66513596412951 is a deficient number, since it is larger than the sum of its proper divisors (35436997932649).

66513596412951 is an equidigital number, since it uses as much as digits as its factorization.

66513596412951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365546657 (or 6365546645 counting only the distinct ones).

The product of its digits is 52488000, while the sum is 63.

The spelling of 66513596412951 in words is "sixty-six trillion, five hundred thirteen billion, five hundred ninety-six million, four hundred twelve thousand, nine hundred fifty-one".