645015642047 has 16 divisors (see below), whose sum is σ = 780550348032. Its totient is φ = 520330608000.

The previous prime is 645015642043. The next prime is 645015642113. The reversal of 645015642047 is 740246510546.

It is not a de Polignac number, because 645015642047 - 2² = 645015642043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645015641989 and 645015642007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645015642041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4117988 + ... + 4271750.

It is an arithmetic number, because the mean of its divisors is an integer number (48784396752).

Almost surely, 2^645015642047 is an apocalyptic number.

645015642047 is a deficient number, since it is larger than the sum of its proper divisors (135534705985).

645015642047 is a wasteful number, since it uses less digits than its factorization.

645015642047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189038.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 645015642047 in words is "six hundred forty-five billion, fifteen million, six hundred forty-two thousand, forty-seven".