66461604 has 48 divisors (see below), whose sum is σ = 169779456. Its totient is φ = 20068000.

The previous prime is 66461597. The next prime is 66461611. The reversal of 66461604 is 40616466.

It is an interprime number because it is at equal distance from previous prime (66461597) and next prime (66461611).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45079 + ... + 46529.

It is an arithmetic number, because the mean of its divisors is an integer number (3537072).

Almost surely, 2^66461604 is an apocalyptic number.

It is an amenable number.

66461604 is an abundant number, since it is smaller than the sum of its proper divisors (103317852).

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

66461604 is a wasteful number, since it uses less digits than its factorization.

66461604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 66461604 is about 8152.3986654236. The cubic root of 66461604 is about 405.0639618534.

The spelling of 66461604 in words is "sixty-six million, four hundred sixty-one thousand, six hundred four".