264401279921 has 2 divisors, whose sum is σ = 264401279922. Its totient is φ = 264401279920.

The previous prime is 264401279801. The next prime is 264401279959. The reversal of 264401279921 is 129972104462.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188134725025 + 76266554896 = 433745^2 + 276164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264401279921 is a prime.

It is not a weakly prime, because it can be changed into another prime (264401279981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132200639960 + 132200639961.

It is an arithmetic number, because the mean of its divisors is an integer number (132200639961).

Almost surely, 2^264401279921 is an apocalyptic number.

It is an amenable number.

264401279921 is a deficient number, since it is larger than the sum of its proper divisors (1).

264401279921 is an equidigital number, since it uses as much as digits as its factorization.

264401279921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 264401279921 in words is "two hundred sixty-four billion, four hundred one million, two hundred seventy-nine thousand, nine hundred twenty-one".