645257677312 has 80 divisors (see below), whose sum is σ = 1297388077920. Its totient is φ = 320600051712.

The previous prime is 645257677223. The next prime is 645257677313. The reversal of 645257677312 is 213776752546.

It is not an unprimeable number, because it can be changed into a prime (645257677313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54040239 + ... + 54052177.

It is an arithmetic number, because the mean of its divisors is an integer number (16217350974).

Almost surely, 2^645257677312 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 645257677312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (648694038960).

645257677312 is an abundant number, since it is smaller than the sum of its proper divisors (652130400608).

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

645257677312 is a wasteful number, since it uses less digits than its factorization.

645257677312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12613 (or 12597 counting only the distinct ones).

The product of its digits is 14817600, while the sum is 55.

The spelling of 645257677312 in words is "six hundred forty-five billion, two hundred fifty-seven million, six hundred seventy-seven thousand, three hundred twelve".