66760646 has 4 divisors (see below), whose sum is σ = 100140972. Its totient is φ = 33380322.

The previous prime is 66760567. The next prime is 66760667. The reversal of 66760646 is 64606766.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16690160 + ... + 16690163.

It is an arithmetic number, because the mean of its divisors is an integer number (25035243).

Almost surely, 2^66760646 is an apocalyptic number.

66760646 is a deficient number, since it is larger than the sum of its proper divisors (33380326).

66760646 is a wasteful number, since it uses less digits than its factorization.

66760646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33380325.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 66760646 is about 8170.7188178275. The cubic root of 66760646 is about 405.6705773400.

The spelling of 66760646 in words is "sixty-six million, seven hundred sixty thousand, six hundred forty-six".