645015642045 has 32 divisors (see below), whose sum is σ = 1081216450560. Its totient is φ = 327942457920.

The previous prime is 645015642043. The next prime is 645015642113. The reversal of 645015642045 is 540246510546.

It is not a de Polignac number, because 645015642045 - 2¹ = 645015642043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645015641988 and 645015642006.

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 31 ways as a sum of consecutive naturals, for example, 10320565 + ... + 10382874.

It is an arithmetic number, because the mean of its divisors is an integer number (33788014080).

Almost surely, 2^645015642045 is an apocalyptic number.

It is an amenable number.

645015642045 is a deficient number, since it is larger than the sum of its proper divisors (436200808515).

645015642045 is a wasteful number, since it uses less digits than its factorization.

645015642045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20703545.

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 645015642045 in words is "six hundred forty-five billion, fifteen million, six hundred forty-two thousand, forty-five".