7879656561 has 16 divisors (see below), whose sum is σ = 12286331904. Its totient is φ = 4397947344.

The previous prime is 7879656557. The next prime is 7879656583. The reversal of 7879656561 is 1656569787.

It is not a de Polignac number, because 7879656561 - 2² = 7879656557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7879656495 and 7879656504.

It is not an unprimeable number, because it can be changed into a prime (7879656511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4362141 + ... + 4363946.

It is an arithmetic number, because the mean of its divisors is an integer number (767895744).

Almost surely, 2^7879656561 is an apocalyptic number.

It is an amenable number.

7879656561 is a deficient number, since it is larger than the sum of its proper divisors (4406675343).

7879656561 is a wasteful number, since it uses less digits than its factorization.

7879656561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8726140.

The product of its digits is 19051200, while the sum is 60.

The square root of 7879656561 is about 88767.4296180756. The cubic root of 7879656561 is about 1989.9206689586.

The spelling of 7879656561 in words is "seven billion, eight hundred seventy-nine million, six hundred fifty-six thousand, five hundred sixty-one".