66908763 has 12 divisors (see below), whose sum is σ = 97604208. Its totient is φ = 44163600.

The previous prime is 66908759. The next prime is 66908791. The reversal of 66908763 is 36780966.

It is not a de Polignac number, because 66908763 - 2² = 66908759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66908263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35895 + ... + 37712.

It is an arithmetic number, because the mean of its divisors is an integer number (8133684).

Almost surely, 2^66908763 is an apocalyptic number.

66908763 is a deficient number, since it is larger than the sum of its proper divisors (30695445).

66908763 is a wasteful number, since it uses less digits than its factorization.

66908763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73714 (or 73711 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66908763 is about 8179.7776864656. Note that the first 3 decimals coincide. The cubic root of 66908763 is about 405.9703663650.

The spelling of 66908763 in words is "sixty-six million, nine hundred eight thousand, seven hundred sixty-three".