81542248151 has 32 divisors (see below), whose sum is σ = 104901350400. Its totient is φ = 61606854144.

The previous prime is 81542248097. The next prime is 81542248153. The reversal of 81542248151 is 15184224518.

It is a cyclic number.

It is not a de Polignac number, because 81542248151 - 2⁶ = 81542248087 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81542248099 and 81542248108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81542248153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1208300 + ... + 1273998.

It is an arithmetic number, because the mean of its divisors is an integer number (3278167200).

Almost surely, 2^81542248151 is an apocalyptic number.

81542248151 is a deficient number, since it is larger than the sum of its proper divisors (23359102249).

81542248151 is a wasteful number, since it uses less digits than its factorization.

81542248151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66335.

The product of its digits is 102400, while the sum is 41.

The spelling of 81542248151 in words is "eighty-one billion, five hundred forty-two million, two hundred forty-eight thousand, one hundred fifty-one".