66691692 has 36 divisors (see below), whose sum is σ = 169345176. Its totient is φ = 22129920.

The previous prime is 66691657. The next prime is 66691693. The reversal of 66691692 is 29619666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×66691692³ (a number of 24 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (66691693) 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, 4092 + ... + 12252.

Almost surely, 2^66691692 is an apocalyptic number.

It is an amenable number.

66691692 is an abundant number, since it is smaller than the sum of its proper divisors (102653484).

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

66691692 is a wasteful number, since it uses less digits than its factorization.

66691692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8398 (or 8393 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 66691692 is about 8166.4981479212. The cubic root of 66691692 is about 405.5308630685.

The spelling of 66691692 in words is "sixty-six million, six hundred ninety-one thousand, six hundred ninety-two".