81246412542 has 16 divisors (see below), whose sum is σ = 162554570640. Its totient is φ = 27071846592.

The previous prime is 81246412531. The next prime is 81246412553. The reversal of 81246412542 is 24521464218.

It is an interprime number because it is at equal distance from previous prime (81246412531) and next prime (81246412553).

It is a super-3 number, since 3×81246412542³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81246412542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2555617 + ... + 2587212.

It is an arithmetic number, because the mean of its divisors is an integer number (10159660665).

Almost surely, 2^81246412542 is an apocalyptic number.

81246412542 is an abundant number, since it is smaller than the sum of its proper divisors (81308158098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81246412542 is a wasteful number, since it uses less digits than its factorization.

81246412542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145467.

The product of its digits is 122880, while the sum is 39.

The spelling of 81246412542 in words is "eighty-one billion, two hundred forty-six million, four hundred twelve thousand, five hundred forty-two".