66715655601 has 16 divisors (see below), whose sum is σ = 102037096448. Its totient is φ = 37982552400.

The previous prime is 66715655561. The next prime is 66715655731. The reversal of 66715655601 is 10655651766.

It is not a de Polignac number, because 66715655601 - 2¹⁴ = 66715639217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66715654601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5855815 + ... + 5867196.

It is an arithmetic number, because the mean of its divisors is an integer number (6377318528).

Almost surely, 2^66715655601 is an apocalyptic number.

It is an amenable number.

66715655601 is a deficient number, since it is larger than the sum of its proper divisors (35321440847).

66715655601 is a wasteful number, since it uses less digits than its factorization.

66715655601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11723292.

The product of its (nonzero) digits is 1134000, while the sum is 48.

The spelling of 66715655601 in words is "sixty-six billion, seven hundred fifteen million, six hundred fifty-five thousand, six hundred one".