501561655 has 16 divisors (see below), whose sum is σ = 699517440. Its totient is φ = 338097312.

The previous prime is 501561649. The next prime is 501561661. The reversal of 501561655 is 556165105.

It is an interprime number because it is at equal distance from previous prime (501561649) and next prime (501561661).

It is not a de Polignac number, because 501561655 - 2⁷ = 501561527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 501561655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119379 + ... + 123508.

It is an arithmetic number, because the mean of its divisors is an integer number (43719840).

Almost surely, 2^501561655 is an apocalyptic number.

501561655 is a deficient number, since it is larger than the sum of its proper divisors (197955785).

501561655 is a wasteful number, since it uses less digits than its factorization.

501561655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242958.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 501561655 is about 22395.5722186329. The cubic root of 501561655 is about 794.5259914481.

The spelling of 501561655 in words is "five hundred one million, five hundred sixty-one thousand, six hundred fifty-five".