66431623 has 8 divisors (see below), whose sum is σ = 68339376. Its totient is φ = 64550400.

The previous prime is 66431611. The next prime is 66431669. The reversal of 66431623 is 32613466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66431623 - 2⁵ = 66431591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66431023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1498 + ... + 11623.

It is an arithmetic number, because the mean of its divisors is an integer number (8542422).

Almost surely, 2^66431623 is an apocalyptic number.

66431623 is a deficient number, since it is larger than the sum of its proper divisors (1907753).

66431623 is a wasteful number, since it uses less digits than its factorization.

66431623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13265.

The product of its digits is 15552, while the sum is 31.

The square root of 66431623 is about 8150.5596740347. The cubic root of 66431623 is about 405.0030442285.

The spelling of 66431623 in words is "sixty-six million, four hundred thirty-one thousand, six hundred twenty-three".