645617278134 has 32 divisors (see below), whose sum is σ = 1461774975840. Its totient is φ = 211145272416.

The previous prime is 645617278123. The next prime is 645617278147. The reversal of 645617278134 is 431872716546.

645617278134 is a `hidden beast` number, since 6 + 4 + 5 + 617 + 2 + 7 + 8 + 13 + 4 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 112788417 + ... + 112794140.

It is an arithmetic number, because the mean of its divisors is an integer number (45680467995).

Almost surely, 2^645617278134 is an apocalyptic number.

645617278134 is an abundant number, since it is smaller than the sum of its proper divisors (816157697706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645617278134 is a wasteful number, since it uses less digits than its factorization.

645617278134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225582621 (or 225582615 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 645617278134 in words is "six hundred forty-five billion, six hundred seventeen million, two hundred seventy-eight thousand, one hundred thirty-four".