66922639 has 4 divisors (see below), whose sum is σ = 76483024. Its totient is φ = 57362256.

The previous prime is 66922613. The next prime is 66922649. The reversal of 66922639 is 93622966.

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

It is not a de Polignac number, because 66922639 - 2⁷ = 66922511 is a prime.

It is a super-2 number, since 2×66922639² = 8957279221448642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66922595 and 66922604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66922649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4780182 + ... + 4780195.

It is an arithmetic number, because the mean of its divisors is an integer number (19120756).

Almost surely, 2^66922639 is an apocalyptic number.

66922639 is a deficient number, since it is larger than the sum of its proper divisors (9560385).

66922639 is an equidigital number, since it uses as much as digits as its factorization.

66922639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9560384.

The product of its digits is 209952, while the sum is 43.

The square root of 66922639 is about 8180.6258318053. The cubic root of 66922639 is about 405.9984287352.

The spelling of 66922639 in words is "sixty-six million, nine hundred twenty-two thousand, six hundred thirty-nine".