66291922 has 4 divisors (see below), whose sum is σ = 99437886. Its totient is φ = 33145960.

The previous prime is 66291913. The next prime is 66291943. The reversal of 66291922 is 22919266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22919266 = 2 ⋅11459633.

It can be written as a sum of positive squares in only one way, i.e., 45306361 + 20985561 = 6731^2 + 4581^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16572979 + ... + 16572982.

Almost surely, 2^66291922 is an apocalyptic number.

66291922 is a deficient number, since it is larger than the sum of its proper divisors (33145964).

66291922 is a wasteful number, since it uses less digits than its factorization.

66291922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33145963.

The product of its digits is 23328, while the sum is 37.

The square root of 66291922 is about 8141.9851387730. The cubic root of 66291922 is about 404.7189474139.

The spelling of 66291922 in words is "sixty-six million, two hundred ninety-one thousand, nine hundred twenty-two".