645442532501 has 8 divisors (see below), whose sum is σ = 698620346424. Its totient is φ = 592768774080.

The previous prime is 645442532477. The next prime is 645442532521. The reversal of 645442532501 is 105235244546.

It can be written as a sum of positive squares in 4 ways, for example, as 52704221476 + 592738311025 = 229574^2 + 769895^2 .

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 645442532501 - 2¹⁰ = 645442531477 is a prime.

It is a super-3 number, since 3×645442532501³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645442532521) 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, 126011210 + ... + 126016331.

It is an arithmetic number, because the mean of its divisors is an integer number (87327543303).

Almost surely, 2^645442532501 is an apocalyptic number.

It is an amenable number.

645442532501 is a deficient number, since it is larger than the sum of its proper divisors (53177813923).

645442532501 is a wasteful number, since it uses less digits than its factorization.

645442532501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252027751.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 645442532501 in words is "six hundred forty-five billion, four hundred forty-two million, five hundred thirty-two thousand, five hundred one".