81039763502 has 8 divisors (see below), whose sum is σ = 121756027800. Its totient is φ = 40454420904.

The previous prime is 81039763457. The next prime is 81039763507. The reversal of 81039763502 is 20536793018.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81039763507) 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, 32728877 + ... + 32731352.

It is an arithmetic number, because the mean of its divisors is an integer number (15219503475).

Almost surely, 2^81039763502 is an apocalyptic number.

81039763502 is a deficient number, since it is larger than the sum of its proper divisors (40716264298).

81039763502 is a wasteful number, since it uses less digits than its factorization.

81039763502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65460850.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 81039763502 in words is "eighty-one billion, thirty-nine million, seven hundred sixty-three thousand, five hundred two".