645165656143360 has 640 divisors, whose sum is σ = 1795818178851840. Its totient is φ = 219832123392000.

The previous prime is 645165656143357. The next prime is 645165656143363. The reversal of 645165656143360 is 63341656561546.

It is an interprime number because it is at equal distance from previous prime (645165656143357) and next prime (645165656143363).

It is a tau number, because it is divible by the number of its divisors (640).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645165656143363) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18824295184 + ... + 18824329456.

It is an arithmetic number, because the mean of its divisors is an integer number (2805965904456).

Almost surely, 2^{645165656143360} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645165656143360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897909089425920).

645165656143360 is an abundant number, since it is smaller than the sum of its proper divisors (1150652522708480).

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

645165656143360 is a wasteful number, since it uses less digits than its factorization.

645165656143360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34710 (or 34694 counting only the distinct ones).

The product of its (nonzero) digits is 139968000, while the sum is 61.

The spelling of 645165656143360 in words is "six hundred forty-five trillion, one hundred sixty-five billion, six hundred fifty-six million, one hundred forty-three thousand, three hundred sixty".