645304135006591 has 8 divisors (see below), whose sum is σ = 645561032611104. Its totient is φ = 645047260522080.

The previous prime is 645304135006561. The next prime is 645304135006691. The reversal of 645304135006591 is 195600531403546.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 645304135006591 - 2⁹ = 645304135006079 is a prime.

It is a super-2 number, since 2×645304135006591² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645304135006561) 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, 50160981 + ... + 61698721.

It is an arithmetic number, because the mean of its divisors is an integer number (80695129076388).

Almost surely, 2^{645304135006591} is an apocalyptic number.

645304135006591 is a deficient number, since it is larger than the sum of its proper divisors (256897604513).

645304135006591 is a wasteful number, since it uses less digits than its factorization.

645304135006591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11560001.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 645304135006591 in words is "six hundred forty-five trillion, three hundred four billion, one hundred thirty-five million, six thousand, five hundred ninety-one".