645312771334 has 16 divisors (see below), whose sum is σ = 1206818689536. Its totient is φ = 251420560200.

The previous prime is 645312771289. The next prime is 645312771407. The reversal of 645312771334 is 433177213546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2095171182 + ... + 2095171489.

It is an arithmetic number, because the mean of its divisors is an integer number (75426168096).

Almost surely, 2^645312771334 is an apocalyptic number.

645312771334 is a deficient number, since it is larger than the sum of its proper divisors (561505918202).

645312771334 is a wasteful number, since it uses less digits than its factorization.

645312771334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190342691.

The product of its digits is 1270080, while the sum is 46.

The spelling of 645312771334 in words is "six hundred forty-five billion, three hundred twelve million, seven hundred seventy-one thousand, three hundred thirty-four".