91618255207 has 2 divisors, whose sum is σ = 91618255208. Its totient is φ = 91618255206.

The previous prime is 91618255187. The next prime is 91618255217. The reversal of 91618255207 is 70255281619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91618255207 - 2¹¹ = 91618253159 is a prime.

It is a super-2 number, since 2×91618255207² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91618255217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45809127603 + 45809127604.

It is an arithmetic number, because the mean of its divisors is an integer number (45809127604).

Almost surely, 2^91618255207 is an apocalyptic number.

91618255207 is a deficient number, since it is larger than the sum of its proper divisors (1).

91618255207 is an equidigital number, since it uses as much as digits as its factorization.

91618255207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 91618255207 in words is "ninety-one billion, six hundred eighteen million, two hundred fifty-five thousand, two hundred seven".