645159060551 has 32 divisors (see below), whose sum is σ = 715169433600. Its totient is φ = 579260056320.

The previous prime is 645159060547. The next prime is 645159060577. The reversal of 645159060551 is 155060951546.

It is not a de Polignac number, because 645159060551 - 2² = 645159060547 is a prime.

It is a super-2 number, since 2×645159060551² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645159060496 and 645159060505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645159060151) 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, 32379170 + ... + 32399088.

It is an arithmetic number, because the mean of its divisors is an integer number (22349044800).

Almost surely, 2^645159060551 is an apocalyptic number.

645159060551 is a deficient number, since it is larger than the sum of its proper divisors (70010373049).

645159060551 is a wasteful number, since it uses less digits than its factorization.

645159060551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20639.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 645159060551 in words is "six hundred forty-five billion, one hundred fifty-nine million, sixty thousand, five hundred fifty-one".