264138673691 has 2 divisors, whose sum is σ = 264138673692. Its totient is φ = 264138673690.

The previous prime is 264138673661. The next prime is 264138673717. The reversal of 264138673691 is 196376831462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264138673691 - 2¹⁸ = 264138411547 is a prime.

It is not a weakly prime, because it can be changed into another prime (264138673661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132069336845 + 132069336846.

It is an arithmetic number, because the mean of its divisors is an integer number (132069336846).

Almost surely, 2^264138673691 is an apocalyptic number.

264138673691 is a deficient number, since it is larger than the sum of its proper divisors (1).

264138673691 is an equidigital number, since it uses as much as digits as its factorization.

264138673691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 56.

The spelling of 264138673691 in words is "two hundred sixty-four billion, one hundred thirty-eight million, six hundred seventy-three thousand, six hundred ninety-one".