66951415965 has 128 divisors (see below), whose sum is σ = 132378624000. Its totient is φ = 28209807360.

The previous prime is 66951415961. The next prime is 66951415981. The reversal of 66951415965 is 56951415966.

It is not a de Polignac number, because 66951415965 - 2² = 66951415961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66951415961) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 36725044 + ... + 36726866.

It is an arithmetic number, because the mean of its divisors is an integer number (1034208000).

Almost surely, 2^66951415965 is an apocalyptic number.

It is an amenable number.

66951415965 is a deficient number, since it is larger than the sum of its proper divisors (65427208035).

66951415965 is a wasteful number, since it uses less digits than its factorization.

66951415965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347.

The product of its digits is 8748000, while the sum is 57.

Subtracting from 66951415965 its reverse (56951415966), we obtain a palindrome (9999999999).

The spelling of 66951415965 in words is "sixty-six billion, nine hundred fifty-one million, four hundred fifteen thousand, nine hundred sixty-five".