66972220402 has 4 divisors (see below), whose sum is σ = 100458330606. Its totient is φ = 33486110200.

The previous prime is 66972220397. The next prime is 66972220411. The reversal of 66972220402 is 20402227966.

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., 51121662201 + 15850558201 = 226101^2 + 125899^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16743055099 + ... + 16743055102.

Almost surely, 2^66972220402 is an apocalyptic number.

66972220402 is a deficient number, since it is larger than the sum of its proper divisors (33486110204).

66972220402 is a wasteful number, since it uses less digits than its factorization.

66972220402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33486110203.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 66972220402 in words is "sixty-six billion, nine hundred seventy-two million, two hundred twenty thousand, four hundred two".