91388022487555 has 16 divisors (see below), whose sum is σ = 113203547069184. Its totient is φ = 70751817901440.

The previous prime is 91388022487549. The next prime is 91388022487561. The reversal of 91388022487555 is 55578422088319.

It is an interprime number because it is at equal distance from previous prime (91388022487549) and next prime (91388022487561).

It is not a de Polignac number, because 91388022487555 - 2⁵ = 91388022487523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78908649 + ... + 80058421.

It is an arithmetic number, because the mean of its divisors is an integer number (7075221691824).

Almost surely, 2^{91388022487555} is an apocalyptic number.

91388022487555 is a deficient number, since it is larger than the sum of its proper divisors (21815524581629).

91388022487555 is a wasteful number, since it uses less digits than its factorization.

91388022487555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662606.

The product of its (nonzero) digits is 193536000, while the sum is 67.

The spelling of 91388022487555 in words is "ninety-one trillion, three hundred eighty-eight billion, twenty-two million, four hundred eighty-seven thousand, five hundred fifty-five".