8479640261 has 2 divisors, whose sum is σ = 8479640262. Its totient is φ = 8479640260.

The previous prime is 8479640251. The next prime is 8479640269. The reversal of 8479640261 is 1620469748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6034337761 + 2445302500 = 77681^2 + 49450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8479640261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8479640269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4239820130 + 4239820131.

It is an arithmetic number, because the mean of its divisors is an integer number (4239820131).

Almost surely, 2^8479640261 is an apocalyptic number.

It is an amenable number.

8479640261 is a deficient number, since it is larger than the sum of its proper divisors (1).

8479640261 is an equidigital number, since it uses as much as digits as its factorization.

8479640261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 8479640261 is about 92084.9621871020. The cubic root of 8479640261 is about 2039.1968083913.

The spelling of 8479640261 in words is "eight billion, four hundred seventy-nine million, six hundred forty thousand, two hundred sixty-one".