18540177292691 has 2 divisors, whose sum is σ = 18540177292692. Its totient is φ = 18540177292690.

The previous prime is 18540177292603. The next prime is 18540177292717. The reversal of 18540177292691 is 19629277104581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18540177292691 - 2²² = 18540173098387 is a prime.

It is not a weakly prime, because it can be changed into another prime (18540177292391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9270088646345 + 9270088646346.

It is an arithmetic number, because the mean of its divisors is an integer number (9270088646346).

Almost surely, 2^{18540177292691} is an apocalyptic number.

18540177292691 is a deficient number, since it is larger than the sum of its proper divisors (1).

18540177292691 is an equidigital number, since it uses as much as digits as its factorization.

18540177292691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 18540177292691 in words is "eighteen trillion, five hundred forty billion, one hundred seventy-seven million, two hundred ninety-two thousand, six hundred ninety-one".