81619274527 has 6 divisors (see below), whose sum is σ = 93280034744. Its totient is φ = 69958730280.

The previous prime is 81619274519. The next prime is 81619274551. The reversal of 81619274527 is 72547291618.

It is not a de Polignac number, because 81619274527 - 2³ = 81619274519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81619274027) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 701877 + ... + 809857.

Almost surely, 2^81619274527 is an apocalyptic number.

81619274527 is a deficient number, since it is larger than the sum of its proper divisors (11660760217).

81619274527 is an frugal number, since it uses more digits than its factorization.

81619274527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215969 (or 107988 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 52.

The spelling of 81619274527 in words is "eighty-one billion, six hundred nineteen million, two hundred seventy-four thousand, five hundred twenty-seven".