81156415954 has 16 divisors (see below), whose sum is σ = 123075042048. Its totient is φ = 40131983232.

The previous prime is 81156415937. The next prime is 81156415969. The reversal of 81156415954 is 45951465118.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81156415898 and 81156415907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136167 + ... + 425269.

It is an arithmetic number, because the mean of its divisors is an integer number (7692190128).

Almost surely, 2^81156415954 is an apocalyptic number.

81156415954 is a deficient number, since it is larger than the sum of its proper divisors (41918626094).

81156415954 is a wasteful number, since it uses less digits than its factorization.

81156415954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290649.

The product of its digits is 864000, while the sum is 49.

The spelling of 81156415954 in words is "eighty-one billion, one hundred fifty-six million, four hundred fifteen thousand, nine hundred fifty-four".