81408002142 has 32 divisors (see below), whose sum is σ = 171020136960. Its totient is φ = 25784272800.

The previous prime is 81408002141. The next prime is 81408002147. The reversal of 81408002142 is 24120080418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81408002141) 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, 1932517 + ... + 1974192.

It is an arithmetic number, because the mean of its divisors is an integer number (5344379280).

Almost surely, 2^81408002142 is an apocalyptic number.

81408002142 is an abundant number, since it is smaller than the sum of its proper divisors (89612134818).

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

81408002142 is a wasteful number, since it uses less digits than its factorization.

81408002142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906888.

The product of its (nonzero) digits is 4096, while the sum is 30.

The spelling of 81408002142 in words is "eighty-one billion, four hundred eight million, two thousand, one hundred forty-two".