66640377999 has 8 divisors (see below), whose sum is σ = 95688747952. Its totient is φ = 41009463360.

The previous prime is 66640377967. The next prime is 66640378027. The reversal of 66640377999 is 99977304666.

66640377999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66640377999 - 2⁵ = 66640377967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66640377949) 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, 854363782 + ... + 854363859.

It is an arithmetic number, because the mean of its divisors is an integer number (11961093494).

Almost surely, 2^66640377999 is an apocalyptic number.

66640377999 is a deficient number, since it is larger than the sum of its proper divisors (29048369953).

66640377999 is a wasteful number, since it uses less digits than its factorization.

66640377999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708727657.

The product of its (nonzero) digits is 92588832, while the sum is 66.

The spelling of 66640377999 in words is "sixty-six billion, six hundred forty million, three hundred seventy-seven thousand, nine hundred ninety-nine".