81040023002 has 8 divisors (see below), whose sum is σ = 121624391700. Its totient is φ = 40498559104.

The previous prime is 81040022969. The next prime is 81040023019. The reversal of 81040023002 is 20032004018.

It can be written as a sum of positive squares in 2 ways, for example, as 77690970361 + 3349052641 = 278731^2 + 57871^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10721477 + ... + 10729032.

Almost surely, 2^81040023002 is an apocalyptic number.

81040023002 is a deficient number, since it is larger than the sum of its proper divisors (40584368698).

81040023002 is a wasteful number, since it uses less digits than its factorization.

81040023002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21452400.

The product of its (nonzero) digits is 384, while the sum is 20.

The spelling of 81040023002 in words is "eighty-one billion, forty million, twenty-three thousand, two".