66121929 has 12 divisors (see below), whose sum is σ = 95992000. Its totient is φ = 43858584.

The previous prime is 66121921. The next prime is 66121931. The reversal of 66121929 is 92912166.

66121929 is a `hidden beast` number, since 6 + 612 + 19 + 29 = 666.

It is not a de Polignac number, because 66121929 - 2³ = 66121921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66121893 and 66121902.

It is not an unprimeable number, because it can be changed into a prime (66121921) 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, 16669 + ... + 20250.

Almost surely, 2^66121929 is an apocalyptic number.

It is an amenable number.

66121929 is a deficient number, since it is larger than the sum of its proper divisors (29870071).

66121929 is a wasteful number, since it uses less digits than its factorization.

66121929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37124 (or 37121 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 66121929 is about 8131.5391531985. The cubic root of 66121929 is about 404.3727097552.

The spelling of 66121929 in words is "sixty-six million, one hundred twenty-one thousand, nine hundred twenty-nine".