66923081 has 4 divisors (see below), whose sum is σ = 67240464. Its totient is φ = 66605700.

The previous prime is 66923071. The next prime is 66923083. The reversal of 66923081 is 18032966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66923081 - 2¹⁰ = 66922057 is a prime.

It is a super-2 number, since 2×66923081² = 8957397541065122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66923083) 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, 158375 + ... + 158796.

It is an arithmetic number, because the mean of its divisors is an integer number (16810116).

Almost surely, 2^66923081 is an apocalyptic number.

It is an amenable number.

66923081 is a deficient number, since it is larger than the sum of its proper divisors (317383).

66923081 is a wasteful number, since it uses less digits than its factorization.

66923081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317382.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 66923081 is about 8180.6528468087. The cubic root of 66923081 is about 405.9993225579. Note that the first 3 decimals are identical.

The spelling of 66923081 in words is "sixty-six million, nine hundred twenty-three thousand, eighty-one".