66506464 has 24 divisors (see below), whose sum is σ = 134475768. Its totient is φ = 32353920.

The previous prime is 66506443. The next prime is 66506477. The reversal of 66506464 is 46460566.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26902 + ... + 29269.

It is an arithmetic number, because the mean of its divisors is an integer number (5603157).

Almost surely, 2^66506464 is an apocalyptic number.

It is an amenable number.

66506464 is an abundant number, since it is smaller than the sum of its proper divisors (67969304).

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

66506464 is a wasteful number, since it uses less digits than its factorization.

66506464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56218 (or 56210 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 66506464 is about 8155.1495387884. The cubic root of 66506464 is about 405.1550775323.

The spelling of 66506464 in words is "sixty-six million, five hundred six thousand, four hundred sixty-four".