81035424779 has 2 divisors, whose sum is σ = 81035424780. Its totient is φ = 81035424778.

The previous prime is 81035424733. The next prime is 81035424793. The reversal of 81035424779 is 97742453018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81035424779 - 2¹⁶ = 81035359243 is a prime.

It is a super-2 number, since 2×81035424779² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81035424079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40517712389 + 40517712390.

It is an arithmetic number, because the mean of its divisors is an integer number (40517712390).

Almost surely, 2^81035424779 is an apocalyptic number.

81035424779 is a deficient number, since it is larger than the sum of its proper divisors (1).

81035424779 is an equidigital number, since it uses as much as digits as its factorization.

81035424779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 81035424779 in words is "eighty-one billion, thirty-five million, four hundred twenty-four thousand, seven hundred seventy-nine".