81711951502 has 16 divisors (see below), whose sum is σ = 124889833152. Its totient is φ = 40082122080.

The previous prime is 81711951481. The next prime is 81711951509. The reversal of 81711951502 is 20515911718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81711951509) 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, 2249428 + ... + 2285464.

It is an arithmetic number, because the mean of its divisors is an integer number (7805614572).

Almost surely, 2^81711951502 is an apocalyptic number.

81711951502 is a deficient number, since it is larger than the sum of its proper divisors (43177881650).

81711951502 is a wasteful number, since it uses less digits than its factorization.

81711951502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57483.

The product of its (nonzero) digits is 25200, while the sum is 40.

The spelling of 81711951502 in words is "eighty-one billion, seven hundred eleven million, nine hundred fifty-one thousand, five hundred two".