641502157477 has 8 divisors (see below), whose sum is σ = 643572383832. Its totient is φ = 639435264000.

The previous prime is 641502157469. The next prime is 641502157481. The reversal of 641502157477 is 774751205146.

It can be written as a sum of positive squares in 4 ways, for example, as 450007522276 + 191494635201 = 670826^2 + 437601^2 .

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 641502157477 - 2³ = 641502157469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641502157477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641502157277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447358 + ... + 1217839.

It is an arithmetic number, because the mean of its divisors is an integer number (80446547979).

Almost surely, 2^641502157477 is an apocalyptic number.

It is an amenable number.

641502157477 is a deficient number, since it is larger than the sum of its proper divisors (2070226355).

641502157477 is a wasteful number, since it uses less digits than its factorization.

641502157477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666439.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 641502157477 in words is "six hundred forty-one billion, five hundred two million, one hundred fifty-seven thousand, four hundred seventy-seven".