91106066251 has 2 divisors, whose sum is σ = 91106066252. Its totient is φ = 91106066250.

The previous prime is 91106066243. The next prime is 91106066279. The reversal of 91106066251 is 15266060119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91106066251 - 2³ = 91106066243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91106066251.

It is not a weakly prime, because it can be changed into another prime (91106066281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45553033125 + 45553033126.

It is an arithmetic number, because the mean of its divisors is an integer number (45553033126).

Almost surely, 2^91106066251 is an apocalyptic number.

91106066251 is a deficient number, since it is larger than the sum of its proper divisors (1).

91106066251 is an equidigital number, since it uses as much as digits as its factorization.

91106066251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 91106066251 in words is "ninety-one billion, one hundred six million, sixty-six thousand, two hundred fifty-one".