645053015879 has 4 divisors (see below), whose sum is σ = 645076120176. Its totient is φ = 645029911584.

The previous prime is 645053015863. The next prime is 645053015899. The reversal of 645053015879 is 978510350546.

It is a happy number.

645053015879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645053015879 - 2⁴ = 645053015863 is a prime.

It is a super-2 number, since 2×645053015879² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645053015879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645053015819) 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, 11510219 + ... + 11566124.

It is an arithmetic number, because the mean of its divisors is an integer number (161269030044).

Almost surely, 2^645053015879 is an apocalyptic number.

645053015879 is a deficient number, since it is larger than the sum of its proper divisors (23104297).

645053015879 is a wasteful number, since it uses less digits than its factorization.

645053015879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23104296.

The product of its (nonzero) digits is 4536000, while the sum is 53.

The spelling of 645053015879 in words is "six hundred forty-five billion, fifty-three million, fifteen thousand, eight hundred seventy-nine".