80631009961 has 2 divisors, whose sum is σ = 80631009962. Its totient is φ = 80631009960.

The previous prime is 80631009923. The next prime is 80631010007. The reversal of 80631009961 is 16990013608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80631009936 + 25 = 283956^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 80631009961 - 2¹¹ = 80631007913 is a prime.

It is not a weakly prime, because it can be changed into another prime (80631009661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40315504980 + 40315504981.

It is an arithmetic number, because the mean of its divisors is an integer number (40315504981).

Almost surely, 2^80631009961 is an apocalyptic number.

It is an amenable number.

80631009961 is a deficient number, since it is larger than the sum of its proper divisors (1).

80631009961 is an equidigital number, since it uses as much as digits as its factorization.

80631009961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 80631009961 in words is "eighty billion, six hundred thirty-one million, nine thousand, nine hundred sixty-one".