645425444155 has 4 divisors (see below), whose sum is σ = 774510532992. Its totient is φ = 516340355320.

The previous prime is 645425444117. The next prime is 645425444197. The reversal of 645425444155 is 551444524546.

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

It is not a de Polignac number, because 645425444155 - 2²¹ = 645423347003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645425444099 and 645425444108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64542544411 + ... + 64542544420.

It is an arithmetic number, because the mean of its divisors is an integer number (193627633248).

Almost surely, 2^645425444155 is an apocalyptic number.

645425444155 is a deficient number, since it is larger than the sum of its proper divisors (129085088837).

645425444155 is a wasteful number, since it uses less digits than its factorization.

645425444155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129085088836.

The product of its digits is 7680000, while the sum is 49.

The spelling of 645425444155 in words is "six hundred forty-five billion, four hundred twenty-five million, four hundred forty-four thousand, one hundred fifty-five".