645065712361 has 8 divisors (see below), whose sum is σ = 738432488960. Its totient is φ = 552002568768.

The previous prime is 645065712359. The next prime is 645065712397. The reversal of 645065712361 is 163217560546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645065712361 - 2¹ = 645065712359 is a prime.

It is a super-2 number, since 2×645065712361² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645065712301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75903696 + ... + 75912193.

It is an arithmetic number, because the mean of its divisors is an integer number (92304061120).

Almost surely, 2^645065712361 is an apocalyptic number.

It is an amenable number.

645065712361 is a deficient number, since it is larger than the sum of its proper divisors (93366776599).

645065712361 is a wasteful number, since it uses less digits than its factorization.

645065712361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151816503.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 645065712361 in words is "six hundred forty-five billion, sixty-five million, seven hundred twelve thousand, three hundred sixty-one".