641560145251 has 4 divisors (see below), whose sum is σ = 641860362712. Its totient is φ = 641259927792.

The previous prime is 641560145221. The next prime is 641560145273. The reversal of 641560145251 is 152541065146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152541065146 = 2 ⋅76270532573.

It is a cyclic number.

It is not a de Polignac number, because 641560145251 - 2³⁷ = 504121191779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641560145221) 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, 150105525 + ... + 150109798.

It is an arithmetic number, because the mean of its divisors is an integer number (160465090678).

Almost surely, 2^641560145251 is an apocalyptic number.

641560145251 is a deficient number, since it is larger than the sum of its proper divisors (300217461).

641560145251 is a wasteful number, since it uses less digits than its factorization.

641560145251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300217460.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 641560145251 in words is "six hundred forty-one billion, five hundred sixty million, one hundred forty-five thousand, two hundred fifty-one".