81042253461399 has 8 divisors (see below), whose sum is σ = 109066210266240. Its totient is φ = 53523232815416.

The previous prime is 81042253461341. The next prime is 81042253461427. The reversal of 81042253461399 is 99316435224018.

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

It is a cyclic number.

It is not a de Polignac number, because 81042253461399 - 2¹⁷ = 81042253330327 is a prime.

It is a super-2 number, since 2×81042253461399² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81042253861399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126234039339 + ... + 126234039980.

It is an arithmetic number, because the mean of its divisors is an integer number (13633276283280).

Almost surely, 2^{81042253461399} is an apocalyptic number.

81042253461399 is a deficient number, since it is larger than the sum of its proper divisors (28023956804841).

81042253461399 is a wasteful number, since it uses less digits than its factorization.

81042253461399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252468079429.

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 81042253461399 in words is "eighty-one trillion, forty-two billion, two hundred fifty-three million, four hundred sixty-one thousand, three hundred ninety-nine".