20158629961 has 2 divisors, whose sum is σ = 20158629962. Its totient is φ = 20158629960.

The previous prime is 20158629917. The next prime is 20158629989. The reversal of 20158629961 is 16992685102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20158604361 + 25600 = 141981^2 + 160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20158629961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20158629761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10079314980 + 10079314981.

It is an arithmetic number, because the mean of its divisors is an integer number (10079314981).

Almost surely, 2^20158629961 is an apocalyptic number.

It is an amenable number.

20158629961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20158629961 is an equidigital number, since it uses as much as digits as its factorization.

20158629961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 20158629961 in words is "twenty billion, one hundred fifty-eight million, six hundred twenty-nine thousand, nine hundred sixty-one".