20331440012977 has 2 divisors, whose sum is σ = 20331440012978. Its totient is φ = 20331440012976.

The previous prime is 20331440012963. The next prime is 20331440012981. The reversal of 20331440012977 is 77921004413302.

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., 15544441710736 + 4786998302241 = 3942644^2 + 2187921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331440012977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20331440012777) 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, 10165720006488 + 10165720006489.

It is an arithmetic number, because the mean of its divisors is an integer number (10165720006489).

Almost surely, 2^{20331440012977} is an apocalyptic number.

It is an amenable number.

20331440012977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331440012977 is an equidigital number, since it uses as much as digits as its factorization.

20331440012977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 43.

The spelling of 20331440012977 in words is "twenty trillion, three hundred thirty-one billion, four hundred forty million, twelve thousand, nine hundred seventy-seven".