645454135536 has 80 divisors (see below), whose sum is σ = 1905713693184. Its totient is φ = 184407028992.

The previous prime is 645454135523. The next prime is 645454135537. The reversal of 645454135536 is 635531454546.

It is a happy number.

It is a super-2 number, since 2×645454135536² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645454135537) 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, 13649245 + ... + 13696451.

Almost surely, 2^645454135536 is an apocalyptic number.

It is an amenable number.

645454135536 is an abundant number, since it is smaller than the sum of its proper divisors (1260259557648).

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

645454135536 is a wasteful number, since it uses less digits than its factorization.

645454135536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87918 (or 87912 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 51.

The spelling of 645454135536 in words is "six hundred forty-five billion, four hundred fifty-four million, one hundred thirty-five thousand, five hundred thirty-six".