645701793839988 has 12 divisors (see below), whose sum is σ = 1506637518960000. Its totient is φ = 215233931279992.

The previous prime is 645701793839987. The next prime is 645701793840007. The reversal of 645701793839988 is 889938397107546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×645701793839988³ (a number of 45 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645701793839987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26904241409988 + ... + 26904241410011.

It is an arithmetic number, because the mean of its divisors is an integer number (125553126580000).

Almost surely, 2^{645701793839988} is an apocalyptic number.

It is an amenable number.

645701793839988 is an abundant number, since it is smaller than the sum of its proper divisors (860935725120012).

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

645701793839988 is a wasteful number, since it uses less digits than its factorization.

645701793839988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53808482820006 (or 53808482820004 counting only the distinct ones).

The product of its (nonzero) digits is 19752284160, while the sum is 87.

The spelling of 645701793839988 in words is "six hundred forty-five trillion, seven hundred one billion, seven hundred ninety-three million, eight hundred thirty-nine thousand, nine hundred eighty-eight".