7975256781 has 8 divisors (see below), whose sum is σ = 10640242144. Its totient is φ = 5313554640.

The previous prime is 7975256759. The next prime is 7975256833. The reversal of 7975256781 is 1876525797.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7975256781 - 2⁵ = 7975256749 is a prime.

It is a super-2 number, since 2×7975256781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7975256701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 815131 + ... + 824856.

It is an arithmetic number, because the mean of its divisors is an integer number (1330030268).

Almost surely, 2^7975256781 is an apocalyptic number.

It is an amenable number.

7975256781 is a deficient number, since it is larger than the sum of its proper divisors (2664985363).

7975256781 is a wasteful number, since it uses less digits than its factorization.

7975256781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641611.

The product of its digits is 7408800, while the sum is 57.

The square root of 7975256781 is about 89304.2931834747. The cubic root of 7975256781 is about 1997.9359356353.

The spelling of 7975256781 in words is "seven billion, nine hundred seventy-five million, two hundred fifty-six thousand, seven hundred eighty-one".