81916942055 has 16 divisors (see below), whose sum is σ = 106562979264. Its totient is φ = 60091891200.

The previous prime is 81916942049. The next prime is 81916942061. The reversal of 81916942055 is 55024961918.

It is an interprime number because it is at equal distance from previous prime (81916942049) and next prime (81916942061).

It is not a de Polignac number, because 81916942055 - 2⁶ = 81916941991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81916941994 and 81916942012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4163234 + ... + 4182863.

It is an arithmetic number, because the mean of its divisors is an integer number (6660186204).

Almost surely, 2^81916942055 is an apocalyptic number.

81916942055 is a deficient number, since it is larger than the sum of its proper divisors (24646037209).

81916942055 is a wasteful number, since it uses less digits than its factorization.

81916942055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346266.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 81916942055 in words is "eighty-one billion, nine hundred sixteen million, nine hundred forty-two thousand, fifty-five".