81015402567 has 16 divisors (see below), whose sum is σ = 117845350272. Its totient is φ = 49098258720.

The previous prime is 81015402551. The next prime is 81015402577. The reversal of 81015402567 is 76520451018.

It is not a de Polignac number, because 81015402567 - 2⁴ = 81015402551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81015402527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1516393 + ... + 1568909.

It is an arithmetic number, because the mean of its divisors is an integer number (7365334392).

Almost surely, 2^81015402567 is an apocalyptic number.

81015402567 is a deficient number, since it is larger than the sum of its proper divisors (36829947705).

81015402567 is a wasteful number, since it uses less digits than its factorization.

81015402567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99278.

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 81015402567 in words is "eighty-one billion, fifteen million, four hundred two thousand, five hundred sixty-seven".