81016314542 has 4 divisors (see below), whose sum is σ = 121524471816. Its totient is φ = 40508157270.

The previous prime is 81016314523. The next prime is 81016314611. The reversal of 81016314542 is 24541361018.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20254078634 + ... + 20254078637.

It is an arithmetic number, because the mean of its divisors is an integer number (30381117954).

Almost surely, 2^81016314542 is an apocalyptic number.

81016314542 is a deficient number, since it is larger than the sum of its proper divisors (40508157274).

81016314542 is a wasteful number, since it uses less digits than its factorization.

81016314542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40508157273.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 81016314542 in words is "eighty-one billion, sixteen million, three hundred fourteen thousand, five hundred forty-two".