645075570546 has 64 divisors (see below), whose sum is σ = 1574176204800. Its totient is φ = 194182866000.

The previous prime is 645075570521. The next prime is 645075570553.

It is a happy number.

645075570546 is a `hidden beast` number, since 6 + 45 + 0 + 7 + 5 + 57 + 0 + 546 = 666.

645075570546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645075570546² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 645075570492 and 645075570501.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3506286 + ... + 3685673.

It is an arithmetic number, because the mean of its divisors is an integer number (24596503200).

Almost surely, 2^645075570546 is an apocalyptic number.

645075570546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645075570546 is an abundant number, since it is smaller than the sum of its proper divisors (929100634254).

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

645075570546 is a wasteful number, since it uses less digits than its factorization.

645075570546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7192132 (or 7192126 counting only the distinct ones).

The product of its (nonzero) digits is 17640000, while the sum is 54.

The spelling of 645075570546 in words is "six hundred forty-five billion, seventy-five million, five hundred seventy thousand, five hundred forty-six".