2561276172 has 192 divisors, whose sum is σ = 7857561600. Its totient is φ = 630927360.

The previous prime is 2561276153. The next prime is 2561276257. The reversal of 2561276172 is 2716721652.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 2561276172.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 980404 + ... + 983012.

It is an arithmetic number, because the mean of its divisors is an integer number (40924800).

Almost surely, 2^2561276172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2561276172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3928780800).

2561276172 is an abundant number, since it is smaller than the sum of its proper divisors (5296285428).

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

2561276172 is a wasteful number, since it uses less digits than its factorization.

2561276172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2696 (or 2694 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 2561276172 is about 50609.0522732841. The cubic root of 2561276172 is about 1368.2080345193.

The spelling of 2561276172 in words is "two billion, five hundred sixty-one million, two hundred seventy-six thousand, one hundred seventy-two".