645269976371 has 8 divisors (see below), whose sum is σ = 646756823424. Its totient is φ = 643784215680.

The previous prime is 645269976283. The next prime is 645269976391. The reversal of 645269976371 is 173679962546.

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 645269976371 - 2¹⁰ = 645269975347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645269976298 and 645269976307.

It is not an unprimeable number, because it can be changed into a prime (645269976391) 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, 923771 + ... + 1464203.

It is an arithmetic number, because the mean of its divisors is an integer number (80844602928).

Almost surely, 2^645269976371 is an apocalyptic number.

645269976371 is a deficient number, since it is larger than the sum of its proper divisors (1486847053).

645269976371 is a wasteful number, since it uses less digits than its factorization.

645269976371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543181.

The product of its digits is 102876480, while the sum is 65.

The spelling of 645269976371 in words is "six hundred forty-five billion, two hundred sixty-nine million, nine hundred seventy-six thousand, three hundred seventy-one".