66676431 has 16 divisors (see below), whose sum is σ = 95731200. Its totient is φ = 41125248.

The previous prime is 66676429. The next prime is 66676447. The reversal of 66676431 is 13467666.

It is a happy number.

It is not a de Polignac number, because 66676431 - 2¹ = 66676429 is a prime.

It is a super-2 number, since 2×66676431² = 8891492901795522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66676431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66676411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8071 + ... + 14088.

It is an arithmetic number, because the mean of its divisors is an integer number (5983200).

Almost surely, 2^66676431 is an apocalyptic number.

66676431 is a deficient number, since it is larger than the sum of its proper divisors (29054769).

66676431 is a wasteful number, since it uses less digits than its factorization.

66676431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22238.

The product of its digits is 108864, while the sum is 39.

The square root of 66676431 is about 8165.5637282431. The cubic root of 66676431 is about 405.4999282877.

The spelling of 66676431 in words is "sixty-six million, six hundred seventy-six thousand, four hundred thirty-one".