81387755580086 has 16 divisors (see below), whose sum is σ = 122176812551424. Its totient is φ = 40662152158824.

The previous prime is 81387755580073. The next prime is 81387755580163. The reversal of 81387755580086 is 68008555778318.

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, 313233821 + ... + 313493543.

It is an arithmetic number, because the mean of its divisors is an integer number (7636050784464).

Almost surely, 2^{81387755580086} is an apocalyptic number.

81387755580086 is a deficient number, since it is larger than the sum of its proper divisors (40789056971338).

81387755580086 is a wasteful number, since it uses less digits than its factorization.

81387755580086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381275.

The product of its (nonzero) digits is 451584000, while the sum is 71.

The spelling of 81387755580086 in words is "eighty-one trillion, three hundred eighty-seven billion, seven hundred fifty-five million, five hundred eighty thousand, eighty-six".