2561403402 has 24 divisors (see below), whose sum is σ = 5565714336. Its totient is φ = 851338536.

The previous prime is 2561403401. The next prime is 2561403443. The reversal of 2561403402 is 2043041652.

2561403402 is a `hidden beast` number, since 2 + 5 + 614 + 0 + 3 + 40 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (2561403401) 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, 198798 + ... + 211289.

It is an arithmetic number, because the mean of its divisors is an integer number (231904764).

Almost surely, 2^2561403402 is an apocalyptic number.

2561403402 is an abundant number, since it is smaller than the sum of its proper divisors (3004310934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561403402 is a wasteful number, since it uses less digits than its factorization.

2561403402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410442 (or 410439 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2561403402 is about 50610.3092462395. The cubic root of 2561403402 is about 1368.2306891407.

The spelling of 2561403402 in words is "two billion, five hundred sixty-one million, four hundred three thousand, four hundred two".