81080001887887 has 2 divisors, whose sum is σ = 81080001887888. Its totient is φ = 81080001887886.

The previous prime is 81080001887849. The next prime is 81080001887893. The reversal of 81080001887887 is 78878810008018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81080001887887 - 2¹⁵ = 81080001855119 is a prime.

It is a super-2 number, since 2×81080001887887² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81080001881887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40540000943943 + 40540000943944.

It is an arithmetic number, because the mean of its divisors is an integer number (40540000943944).

Almost surely, 2^{81080001887887} is an apocalyptic number.

81080001887887 is a deficient number, since it is larger than the sum of its proper divisors (1).

81080001887887 is an equidigital number, since it uses as much as digits as its factorization.

81080001887887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12845056, while the sum is 64.

The spelling of 81080001887887 in words is "eighty-one trillion, eighty billion, one million, eight hundred eighty-seven thousand, eight hundred eighty-seven".