66516615161 has 8 divisors (see below), whose sum is σ = 68248988544. Its totient is φ = 64792672560.

The previous prime is 66516615149. The next prime is 66516615233. The reversal of 66516615161 is 16151661566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66516615161 - 2²² = 66512420857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66516615131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2091710 + ... + 2123271.

It is an arithmetic number, because the mean of its divisors is an integer number (8531123568).

Almost surely, 2^66516615161 is an apocalyptic number.

It is an amenable number.

66516615161 is a deficient number, since it is larger than the sum of its proper divisors (1732373383).

66516615161 is a wasteful number, since it uses less digits than its factorization.

66516615161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215391.

The product of its digits is 194400, while the sum is 44.

The spelling of 66516615161 in words is "sixty-six billion, five hundred sixteen million, six hundred fifteen thousand, one hundred sixty-one".