7925561617 has 4 divisors (see below), whose sum is σ = 7967056896. Its totient is φ = 7884066340.

The previous prime is 7925561603. The next prime is 7925561629. The reversal of 7925561617 is 7161655297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7161655297 = 17 ⋅421273841.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7925561617 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7925564617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20747353 + ... + 20747734.

It is an arithmetic number, because the mean of its divisors is an integer number (1991764224).

Almost surely, 2^7925561617 is an apocalyptic number.

It is an amenable number.

7925561617 is a deficient number, since it is larger than the sum of its proper divisors (41495279).

7925561617 is a wasteful number, since it uses less digits than its factorization.

7925561617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41495278.

The product of its digits is 793800, while the sum is 49.

The square root of 7925561617 is about 89025.6233732738. The cubic root of 7925561617 is about 1993.7774615020. Note that the first 3 decimals are identical.

The spelling of 7925561617 in words is "seven billion, nine hundred twenty-five million, five hundred sixty-one thousand, six hundred seventeen".