423631342663961 has 2 divisors, whose sum is σ = 423631342663962. Its totient is φ = 423631342663960.

The previous prime is 423631342663957. The next prime is 423631342663973. The reversal of 423631342663961 is 169366243136324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421146573684736 + 2484768979225 = 20521856^2 + 1576315^2 .

It is a cyclic number.

It is not a de Polignac number, because 423631342663961 - 2² = 423631342663957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 423631342663961.

It is not a weakly prime, because it can be changed into another prime (423631342663951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211815671331980 + 211815671331981.

It is an arithmetic number, because the mean of its divisors is an integer number (211815671331981).

Almost surely, 2^{423631342663961} is an apocalyptic number.

It is an amenable number.

423631342663961 is a deficient number, since it is larger than the sum of its proper divisors (1).

423631342663961 is an equidigital number, since it uses as much as digits as its factorization.

423631342663961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60466176, while the sum is 59.

The spelling of 423631342663961 in words is "four hundred twenty-three trillion, six hundred thirty-one billion, three hundred forty-two million, six hundred sixty-three thousand, nine hundred sixty-one".