66658963 has 10 divisors (see below), whose sum is σ = 77766964. Its totient is φ = 57134196.

The previous prime is 66658961. The next prime is 66658993. The reversal of 66658963 is 36985666.

It is not a de Polignac number, because 66658963 - 2¹ = 66658961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66658961) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11481 + ... + 16282.

Almost surely, 2^66658963 is an apocalyptic number.

66658963 is a deficient number, since it is larger than the sum of its proper divisors (11108001).

66658963 is an frugal number, since it uses more digits than its factorization.

66658963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27791 (or 27770 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 49.

The square root of 66658963 is about 8164.4940443361. The cubic root of 66658963 is about 405.4645140177.

The spelling of 66658963 in words is "sixty-six million, six hundred fifty-eight thousand, nine hundred sixty-three".