81156415955 has 4 divisors (see below), whose sum is σ = 97387699152. Its totient is φ = 64925132760.

The previous prime is 81156415937. The next prime is 81156415969. The reversal of 81156415955 is 55951465118.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81156415955 - 2¹⁰ = 81156414931 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8115641591 + ... + 8115641600.

It is an arithmetic number, because the mean of its divisors is an integer number (24346924788).

Almost surely, 2^81156415955 is an apocalyptic number.

81156415955 is a deficient number, since it is larger than the sum of its proper divisors (16231283197).

81156415955 is a wasteful number, since it uses less digits than its factorization.

81156415955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16231283196.

The product of its digits is 1080000, while the sum is 50.

The spelling of 81156415955 in words is "eighty-one billion, one hundred fifty-six million, four hundred fifteen thousand, nine hundred fifty-five".