645415045641 has 24 divisors (see below), whose sum is σ = 970329996480. Its totient is φ = 412890833376.

The previous prime is 645415045637. The next prime is 645415045687. The reversal of 645415045641 is 146540514546.

645415045641 is a `hidden beast` number, since 6 + 4 + 5 + 4 + 150 + 456 + 41 = 666.

It is not a de Polignac number, because 645415045641 - 2² = 645415045637 is a prime.

It is a super-2 number, since 2×645415045641² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645415045601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7542901 + ... + 7627986.

It is an arithmetic number, because the mean of its divisors is an integer number (40430416520).

Almost surely, 2^645415045641 is an apocalyptic number.

It is an amenable number.

645415045641 is a deficient number, since it is larger than the sum of its proper divisors (324914950839).

645415045641 is a wasteful number, since it uses less digits than its factorization.

645415045641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15171085 (or 15171082 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 645415045641 in words is "six hundred forty-five billion, four hundred fifteen million, forty-five thousand, six hundred forty-one".