645255377 has 32 divisors (see below), whose sum is σ = 733286400. Its totient is φ = 563915520.

The previous prime is 645255343. The next prime is 645255419. The reversal of 645255377 is 773552546.

645255377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 645255377 - 2¹⁰ = 645254353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645255277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4330499 + ... + 4330647.

It is an arithmetic number, because the mean of its divisors is an integer number (22915200).

Almost surely, 2^645255377 is an apocalyptic number.

It is an amenable number.

645255377 is a deficient number, since it is larger than the sum of its proper divisors (88031023).

645255377 is a wasteful number, since it uses less digits than its factorization.

645255377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its digits is 882000, while the sum is 44.

The square root of 645255377 is about 25401.8774306152. The cubic root of 645255377 is about 864.1262751430.

The spelling of 645255377 in words is "six hundred forty-five million, two hundred fifty-five thousand, three hundred seventy-seven".