66307929121 has 4 divisors (see below), whose sum is σ = 75780490432. Its totient is φ = 56835367812.

The previous prime is 66307929113. The next prime is 66307929169. The reversal of 66307929121 is 12192970366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66307929121 - 2³ = 66307929113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66307926121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4736280645 + ... + 4736280658.

It is an arithmetic number, because the mean of its divisors is an integer number (18945122608).

Almost surely, 2^66307929121 is an apocalyptic number.

It is an amenable number.

66307929121 is a deficient number, since it is larger than the sum of its proper divisors (9472561311).

66307929121 is an equidigital number, since it uses as much as digits as its factorization.

66307929121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9472561310.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 66307929121 in words is "sixty-six billion, three hundred seven million, nine hundred twenty-nine thousand, one hundred twenty-one".