66777507464 has 128 divisors (see below), whose sum is σ = 138346521600. Its totient is φ = 30098718720.

The previous prime is 66777507449. The next prime is 66777507473. The reversal of 66777507464 is 46470577766.

It is a super-2 number, since 2×66777507464² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88212974 + ... + 88213730.

It is an arithmetic number, because the mean of its divisors is an integer number (1080832200).

Almost surely, 2^66777507464 is an apocalyptic number.

It is an amenable number.

66777507464 is an abundant number, since it is smaller than the sum of its proper divisors (71569014136).

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

66777507464 is a wasteful number, since it uses less digits than its factorization.

66777507464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1099 counting only the distinct ones).

The product of its (nonzero) digits is 41489280, while the sum is 59.

The spelling of 66777507464 in words is "sixty-six billion, seven hundred seventy-seven million, five hundred seven thousand, four hundred sixty-four".