66917697 has 32 divisors (see below), whose sum is σ = 112164864. Its totient is φ = 34473600.

The previous prime is 66917689. The next prime is 66917701. The reversal of 66917697 is 79671966.

It is not a de Polignac number, because 66917697 - 2³ = 66917689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66917647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28197 + ... + 30477.

It is an arithmetic number, because the mean of its divisors is an integer number (3505152).

Almost surely, 2^66917697 is an apocalyptic number.

It is an amenable number.

66917697 is a deficient number, since it is larger than the sum of its proper divisors (45247167).

66917697 is a wasteful number, since it uses less digits than its factorization.

66917697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429.

The product of its digits is 857304, while the sum is 51.

The square root of 66917697 is about 8180.3237710985. The cubic root of 66917697 is about 405.9884346403.

The spelling of 66917697 in words is "sixty-six million, nine hundred seventeen thousand, six hundred ninety-seven".