2561455742 has 16 divisors (see below), whose sum is σ = 3869448192. Its totient is φ = 1271670360.

The previous prime is 2561455717. The next prime is 2561455801. The reversal of 2561455742 is 2475541652.

It is a super-2 number, since 2×2561455742² = 13122111036449541128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2561455742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166517 + ... + 181247.

It is an arithmetic number, because the mean of its divisors is an integer number (241840512).

Almost surely, 2^2561455742 is an apocalyptic number.

2561455742 is a deficient number, since it is larger than the sum of its proper divisors (1307992450).

2561455742 is a wasteful number, since it uses less digits than its factorization.

2561455742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15343.

The product of its digits is 336000, while the sum is 41.

The square root of 2561455742 is about 50610.8263319223. The cubic root of 2561455742 is about 1368.2400086029.

The spelling of 2561455742 in words is "two billion, five hundred sixty-one million, four hundred fifty-five thousand, seven hundred forty-two".