645172640139 has 16 divisors (see below), whose sum is σ = 862141820544. Its totient is φ = 429160166400.

The previous prime is 645172640111. The next prime is 645172640153. The reversal of 645172640139 is 931046271546.

645172640139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645172640139 - 2¹¹ = 645172638091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645172640179) 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, 2818584 + ... + 3038874.

It is an arithmetic number, because the mean of its divisors is an integer number (53883863784).

Almost surely, 2^645172640139 is an apocalyptic number.

645172640139 is a deficient number, since it is larger than the sum of its proper divisors (216969180405).

645172640139 is a wasteful number, since it uses less digits than its factorization.

645172640139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222458.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 645172640139 in words is "six hundred forty-five billion, one hundred seventy-two million, six hundred forty thousand, one hundred thirty-nine".