263736331961 has 2 divisors, whose sum is σ = 263736331962. Its totient is φ = 263736331960.

The previous prime is 263736331951. The next prime is 263736332017. The reversal of 263736331961 is 169133637362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197664714025 + 66071617936 = 444595^2 + 257044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263736331961 is a prime.

It is not a weakly prime, because it can be changed into another prime (263736331951) 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, 131868165980 + 131868165981.

It is an arithmetic number, because the mean of its divisors is an integer number (131868165981).

Almost surely, 2^263736331961 is an apocalyptic number.

It is an amenable number.

263736331961 is a deficient number, since it is larger than the sum of its proper divisors (1).

263736331961 is an equidigital number, since it uses as much as digits as its factorization.

263736331961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 50.

The spelling of 263736331961 in words is "two hundred sixty-three billion, seven hundred thirty-six million, three hundred thirty-one thousand, nine hundred sixty-one".