2561163503 has 8 divisors (see below), whose sum is σ = 2582858496. Its totient is φ = 2539555200.

The previous prime is 2561163497. The next prime is 2561163511. The reversal of 2561163503 is 3053611652.

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 2561163503 - 2¹² = 2561159407 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 2561163503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561163403) 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, 38363 + ... + 81203.

It is an arithmetic number, because the mean of its divisors is an integer number (322857312).

Almost surely, 2^2561163503 is an apocalyptic number.

2561163503 is a deficient number, since it is larger than the sum of its proper divisors (21694993).

2561163503 is a wasteful number, since it uses less digits than its factorization.

2561163503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43345.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 2561163503 is about 50607.9391301404. The cubic root of 2561163503 is about 1368.1879720086.

The spelling of 2561163503 in words is "two billion, five hundred sixty-one million, one hundred sixty-three thousand, five hundred three".