66240697377 has 4 divisors (see below), whose sum is σ = 88320929840. Its totient is φ = 44160464916.

The previous prime is 66240697363. The next prime is 66240697379. The reversal of 66240697377 is 77379604266.

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 not a de Polignac number, because 66240697377 - 2⁷ = 66240697249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66240697379) 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, 11040116227 + ... + 11040116232.

It is an arithmetic number, because the mean of its divisors is an integer number (22080232460).

Almost surely, 2^66240697377 is an apocalyptic number.

It is an amenable number.

66240697377 is a deficient number, since it is larger than the sum of its proper divisors (22080232463).

66240697377 is a wasteful number, since it uses less digits than its factorization.

66240697377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22080232462.

The product of its (nonzero) digits is 16003008, while the sum is 57.

The spelling of 66240697377 in words is "sixty-six billion, two hundred forty million, six hundred ninety-seven thousand, three hundred seventy-seven".