66513123776 has 56 divisors (see below), whose sum is σ = 147334370304. Its totient is φ = 29530126080.

The previous prime is 66513123773. The next prime is 66513123821. The reversal of 66513123776 is 67732131566.

It is a self number, because there is not a number n which added to its sum of digits gives 66513123776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66513123773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1068320 + ... + 1128863.

Almost surely, 2^66513123776 is an apocalyptic number.

It is an amenable number.

66513123776 is an abundant number, since it is smaller than the sum of its proper divisors (80821246528).

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

66513123776 is a wasteful number, since it uses less digits than its factorization.

66513123776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197249 (or 2197239 counting only the distinct ones).

The product of its digits is 952560, while the sum is 47.

The spelling of 66513123776 in words is "sixty-six billion, five hundred thirteen million, one hundred twenty-three thousand, seven hundred seventy-six".