81542248167 has 16 divisors (see below), whose sum is σ = 108884897792. Its totient is φ = 54280605600.

The previous prime is 81542248163. The next prime is 81542248171. The reversal of 81542248167 is 76184224518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81542248163) and next prime (81542248171).

It is not a de Polignac number, because 81542248167 - 2² = 81542248163 is a prime.

It is a super-2 number, since 2×81542248167² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81542248163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7624698 + ... + 7635384.

It is an arithmetic number, because the mean of its divisors is an integer number (6805306112).

Almost surely, 2^81542248167 is an apocalyptic number.

81542248167 is a deficient number, since it is larger than the sum of its proper divisors (27342649625).

81542248167 is a wasteful number, since it uses less digits than its factorization.

81542248167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14238.

The product of its digits is 860160, while the sum is 48.

The spelling of 81542248167 in words is "eighty-one billion, five hundred forty-two million, two hundred forty-eight thousand, one hundred sixty-seven".