79869000581 has 2 divisors, whose sum is σ = 79869000582. Its totient is φ = 79869000580.

The previous prime is 79869000557. The next prime is 79869000587. The reversal of 79869000581 is 18500096897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78005697025 + 1863303556 = 279295^2 + 43166^2 .

It is a cyclic number.

It is not a de Polignac number, because 79869000581 - 2³⁴ = 62689131397 is a prime.

It is a super-2 number, since 2×79869000581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79869000587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39934500290 + 39934500291.

It is an arithmetic number, because the mean of its divisors is an integer number (39934500291).

Almost surely, 2^79869000581 is an apocalyptic number.

It is an amenable number.

79869000581 is a deficient number, since it is larger than the sum of its proper divisors (1).

79869000581 is an equidigital number, since it uses as much as digits as its factorization.

79869000581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 79869000581 in words is "seventy-nine billion, eight hundred sixty-nine million, five hundred eighty-one", and thus it is an aban number.