66156165651 has 8 divisors (see below), whose sum is σ = 89450590464. Its totient is φ = 43482925640.

The previous prime is 66156165643. The next prime is 66156165653. The reversal of 66156165651 is 15656165166.

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 66156165651 - 2³ = 66156165643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66156165651.

It is not an unprimeable number, because it can be changed into a prime (66156165653) 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, 155295951 + ... + 155296376.

It is an arithmetic number, because the mean of its divisors is an integer number (11181323808).

Almost surely, 2^66156165651 is an apocalyptic number.

66156165651 is a deficient number, since it is larger than the sum of its proper divisors (23294424813).

66156165651 is a wasteful number, since it uses less digits than its factorization.

66156165651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310592401.

The product of its digits is 972000, while the sum is 48.

The spelling of 66156165651 in words is "sixty-six billion, one hundred fifty-six million, one hundred sixty-five thousand, six hundred fifty-one".