66694842 has 36 divisors (see below), whose sum is σ = 153517806. Its totient is φ = 20922240.

The previous prime is 66694819. The next prime is 66694847. The reversal of 66694842 is 24849666.

It can be written as a sum of positive squares in 3 ways, for example, as 57927321 + 8767521 = 7611^2 + 2961^2 .

It is not an unprimeable number, because it can be changed into a prime (66694847) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1209 + ... + 11612.

Almost surely, 2^66694842 is an apocalyptic number.

66694842 is an abundant number, since it is smaller than the sum of its proper divisors (86822964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66694842 is a wasteful number, since it uses less digits than its factorization.

66694842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12863 (or 12843 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 66694842 is about 8166.6910067664. The cubic root of 66694842 is about 405.5372476824.

It can be divided in two parts, 6669 and 4842, that added together give a palindrome (11511).

The spelling of 66694842 in words is "sixty-six million, six hundred ninety-four thousand, eight hundred forty-two".