645623134487 has 8 divisors (see below), whose sum is σ = 679617140400. Its totient is φ = 611630512704.

The previous prime is 645623134477. The next prime is 645623134489. The reversal of 645623134487 is 784431326546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645623134487 - 2⁸ = 645623134231 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 (645623134489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691163 + ... + 1330019.

It is an arithmetic number, because the mean of its divisors is an integer number (84952142550).

Almost surely, 2^645623134487 is an apocalyptic number.

645623134487 is a deficient number, since it is larger than the sum of its proper divisors (33994005913).

645623134487 is a wasteful number, since it uses less digits than its factorization.

645623134487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692065.

The product of its digits is 11612160, while the sum is 53.

The spelling of 645623134487 in words is "six hundred forty-five billion, six hundred twenty-three million, one hundred thirty-four thousand, four hundred eighty-seven".