66074697 has 40 divisors (see below), whose sum is σ = 107331840. Its totient is φ = 40266720.

The previous prime is 66074693. The next prime is 66074707. The reversal of 66074697 is 79647066.

It is not a de Polignac number, because 66074697 - 2² = 66074693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66074693) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 137704 + ... + 138182.

It is an arithmetic number, because the mean of its divisors is an integer number (2683296).

Almost surely, 2^66074697 is an apocalyptic number.

It is an amenable number.

66074697 is a deficient number, since it is larger than the sum of its proper divisors (41257143).

66074697 is a wasteful number, since it uses less digits than its factorization.

66074697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 66074697 is about 8128.6343871526. The cubic root of 66074697 is about 404.2764034234.

It can be divided in two parts, 660 and 74697, that added together give a palindrome (75357).

The spelling of 66074697 in words is "sixty-six million, seventy-four thousand, six hundred ninety-seven".