81080001887842 has 8 divisors (see below), whose sum is σ = 121940899938000. Its totient is φ = 40433035241844.

The previous prime is 81080001887831. The next prime is 81080001887849. The reversal of 81080001887842 is 24878810008018.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81080001887842² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81080001887849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53482850092 + ... + 53482851607.

It is an arithmetic number, because the mean of its divisors is an integer number (15242612492250).

Almost surely, 2^{81080001887842} is an apocalyptic number.

81080001887842 is a deficient number, since it is larger than the sum of its proper divisors (40860898050158).

81080001887842 is a wasteful number, since it uses less digits than its factorization.

81080001887842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106965702080.

The product of its (nonzero) digits is 1835008, while the sum is 55.

The spelling of 81080001887842 in words is "eighty-one trillion, eighty billion, one million, eight hundred eighty-seven thousand, eight hundred forty-two".