2561142550 has 24 divisors (see below), whose sum is σ = 4766476176. Its totient is φ = 1023865440.

The previous prime is 2561142539. The next prime is 2561142557. The reversal of 2561142550 is 552411652.

It is a super-2 number, since 2×2561142550² = 13118902322841005000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561142557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78484 + ... + 106216.

It is an arithmetic number, because the mean of its divisors is an integer number (198603174).

Almost surely, 2^2561142550 is an apocalyptic number.

2561142550 is a deficient number, since it is larger than the sum of its proper divisors (2205333626).

2561142550 is a wasteful number, since it uses less digits than its factorization.

2561142550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29592 (or 29587 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 2561142550 is about 50607.7321167428. The cubic root of 2561142550 is about 1368.1842409282.

The spelling of 2561142550 in words is "two billion, five hundred sixty-one million, one hundred forty-two thousand, five hundred fifty".