645699231255 has 16 divisors (see below), whose sum is σ = 1112589444960. Its totient is φ = 317882698368.

The previous prime is 645699231211. The next prime is 645699231319. The reversal of 645699231255 is 552132996546.

It is not a de Polignac number, because 645699231255 - 2⁸ = 645699230999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645699231195 and 645699231204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1655638860 + ... + 1655639249.

It is an arithmetic number, because the mean of its divisors is an integer number (69536840310).

Almost surely, 2^645699231255 is an apocalyptic number.

645699231255 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

645699231255 is a deficient number, since it is larger than the sum of its proper divisors (466890213705).

645699231255 is a wasteful number, since it uses less digits than its factorization.

645699231255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311278130.

The product of its digits is 17496000, while the sum is 57.

The spelling of 645699231255 in words is "six hundred forty-five billion, six hundred ninety-nine million, two hundred thirty-one thousand, two hundred fifty-five".