81292551502 has 16 divisors (see below), whose sum is σ = 122450058720. Its totient is φ = 40475985952.

The previous prime is 81292551497. The next prime is 81292551521. The reversal of 81292551502 is 20515529218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1387824 + ... + 1445212.

It is an arithmetic number, because the mean of its divisors is an integer number (7653128670).

Almost surely, 2^81292551502 is an apocalyptic number.

81292551502 is a deficient number, since it is larger than the sum of its proper divisors (41157507218).

81292551502 is a wasteful number, since it uses less digits than its factorization.

81292551502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60347.

The product of its (nonzero) digits is 72000, while the sum is 40.

The spelling of 81292551502 in words is "eighty-one billion, two hundred ninety-two million, five hundred fifty-one thousand, five hundred two".