7979681956 has 12 divisors (see below), whose sum is σ = 13981970268. Its totient is φ = 3984833312.

The previous prime is 7979681951. The next prime is 7979681971. The reversal of 7979681956 is 6591869797.

It can be written as a sum of positive squares in 2 ways, for example, as 4464377856 + 3515304100 = 66816^2 + 59290^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7979681891 and 7979681900.

It is not an unprimeable number, because it can be changed into a prime (7979681951) 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, 1248331 + ... + 1254706.

It is an arithmetic number, because the mean of its divisors is an integer number (1165164189).

Almost surely, 2^7979681956 is an apocalyptic number.

It is an amenable number.

7979681956 is a deficient number, since it is larger than the sum of its proper divisors (6002288312).

7979681956 is a wasteful number, since it uses less digits than its factorization.

7979681956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503838 (or 2503836 counting only the distinct ones).

The product of its digits is 51438240, while the sum is 67.

The square root of 7979681956 is about 89329.0655721865. The cubic root of 7979681956 is about 1998.3053942278.

The spelling of 7979681956 in words is "seven billion, nine hundred seventy-nine million, six hundred eighty-one thousand, nine hundred fifty-six".