66626402 has 4 divisors (see below), whose sum is σ = 99939606. Its totient is φ = 33313200.

The previous prime is 66626389. The next prime is 66626411. The reversal of 66626402 is 20462666.

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

It can be written as a sum of positive squares in only one way, i.e., 66569281 + 57121 = 8159^2 + 239^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16656599 + ... + 16656602.

Almost surely, 2^66626402 is an apocalyptic number.

66626402 is a deficient number, since it is larger than the sum of its proper divisors (33313204).

66626402 is a wasteful number, since it uses less digits than its factorization.

66626402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33313203.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 66626402 is about 8162.4997396631. The cubic root of 66626402 is about 405.3984839862.

The spelling of 66626402 in words is "sixty-six million, six hundred twenty-six thousand, four hundred two".