66612497 has 8 divisors (see below), whose sum is σ = 76287552. Its totient is φ = 56977200.

The previous prime is 66612493. The next prime is 66612503. The reversal of 66612497 is 79421666.

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

It is not a de Polignac number, because 66612497 - 2² = 66612493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66612493) 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, 6254 + ... + 13127.

It is an arithmetic number, because the mean of its divisors is an integer number (9535944).

Almost surely, 2^66612497 is an apocalyptic number.

It is an amenable number.

66612497 is a deficient number, since it is larger than the sum of its proper divisors (9675055).

66612497 is a wasteful number, since it uses less digits than its factorization.

66612497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19879.

The product of its digits is 108864, while the sum is 41.

The square root of 66612497 is about 8161.6479340878. The cubic root of 66612497 is about 405.3702796610.

The spelling of 66612497 in words is "sixty-six million, six hundred twelve thousand, four hundred ninety-seven".