79458546581 has 2 divisors, whose sum is σ = 79458546582. Its totient is φ = 79458546580.

The previous prime is 79458546547. The next prime is 79458546623. The reversal of 79458546581 is 18564585497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79430403556 + 28143025 = 281834^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 79458546581 - 2²⁶ = 79391437717 is a prime.

It is a super-2 number, since 2×79458546581² (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 (79458546281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39729273290 + 39729273291.

It is an arithmetic number, because the mean of its divisors is an integer number (39729273291).

Almost surely, 2^79458546581 is an apocalyptic number.

It is an amenable number.

79458546581 is a deficient number, since it is larger than the sum of its proper divisors (1).

79458546581 is an equidigital number, since it uses as much as digits as its factorization.

79458546581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384000, while the sum is 62.

The spelling of 79458546581 in words is "seventy-nine billion, four hundred fifty-eight million, five hundred forty-six thousand, five hundred eighty-one".