81432515410 has 8 divisors (see below), whose sum is σ = 146578527756. Its totient is φ = 32573006160.

The previous prime is 81432515347. The next prime is 81432515441. The reversal of 81432515410 is 1451523418.

It can be written as a sum of positive squares in 2 ways, for example, as 80099754361 + 1332761049 = 283019^2 + 36507^2 .

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, 4071625761 + ... + 4071625780.

Almost surely, 2^81432515410 is an apocalyptic number.

81432515410 is a deficient number, since it is larger than the sum of its proper divisors (65146012346).

81432515410 is a wasteful number, since it uses less digits than its factorization.

81432515410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8143251548.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 81432515410 in words is "eighty-one billion, four hundred thirty-two million, five hundred fifteen thousand, four hundred ten".