5645321256961 has 4 divisors (see below), whose sum is σ = 5942443428400. Its totient is φ = 5348199085524.

The previous prime is 5645321256959. The next prime is 5645321257031. The reversal of 5645321256961 is 1696521235465.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5645321256961 - 2¹ = 5645321256959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5645321253961) 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, 148561085691 + ... + 148561085728.

It is an arithmetic number, because the mean of its divisors is an integer number (1485610857100).

Almost surely, 2^{5645321256961} is an apocalyptic number.

It is an amenable number.

5645321256961 is a deficient number, since it is larger than the sum of its proper divisors (297122171439).

5645321256961 is a wasteful number, since it uses less digits than its factorization.

5645321256961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297122171438.

The product of its digits is 11664000, while the sum is 55.

The spelling of 5645321256961 in words is "five trillion, six hundred forty-five billion, three hundred twenty-one million, two hundred fifty-six thousand, nine hundred sixty-one".