645552044477 has 8 divisors (see below), whose sum is σ = 648977817600. Its totient is φ = 642128089680.

The previous prime is 645552044399. The next prime is 645552044479. The reversal of 645552044477 is 774440255546.

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

It is not a de Polignac number, because 645552044477 - 2¹⁰ = 645552043453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645552044479) 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, 260327 + ... + 1165707.

It is an arithmetic number, because the mean of its divisors is an integer number (81122227200).

Almost surely, 2^645552044477 is an apocalyptic number.

It is an amenable number.

645552044477 is a deficient number, since it is larger than the sum of its proper divisors (3425773123).

645552044477 is a wasteful number, since it uses less digits than its factorization.

645552044477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909163.

The product of its (nonzero) digits is 18816000, while the sum is 53.

The spelling of 645552044477 in words is "six hundred forty-five billion, five hundred fifty-two million, forty-four thousand, four hundred seventy-seven".