645574071263 has 48 divisors (see below), whose sum is σ = 752440098816. Its totient is φ = 552311760000.

The previous prime is 645574071257. The next prime is 645574071293. The reversal of 645574071263 is 362170475546.

It is not a de Polignac number, because 645574071263 - 2¹² = 645574067167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645574071223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102942818 + ... + 102949088.

It is an arithmetic number, because the mean of its divisors is an integer number (15675835392).

Almost surely, 2^645574071263 is an apocalyptic number.

645574071263 is a deficient number, since it is larger than the sum of its proper divisors (106866027553).

645574071263 is a wasteful number, since it uses less digits than its factorization.

645574071263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6908 (or 6897 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 645574071263 in words is "six hundred forty-five billion, five hundred seventy-four million, seventy-one thousand, two hundred sixty-three".