645074470740 has 48 divisors (see below), whose sum is σ = 2064238307712. Its totient is φ = 147445593216.

The previous prime is 645074470681. The next prime is 645074470769. The reversal of 645074470740 is 47074470546.

645074470740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645074470740² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645074470740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767945379 + ... + 767946218.

It is an arithmetic number, because the mean of its divisors is an integer number (43004964744).

Almost surely, 2^645074470740 is an apocalyptic number.

645074470740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645074470740 is an abundant number, since it is smaller than the sum of its proper divisors (1419163836972).

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

645074470740 is a wasteful number, since it uses less digits than its factorization.

645074470740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535891616 (or 1535891614 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 48.

The spelling of 645074470740 in words is "six hundred forty-five billion, seventy-four million, four hundred seventy thousand, seven hundred forty".