10643157961 has 2 divisors, whose sum is σ = 10643157962. Its totient is φ = 10643157960.

The previous prime is 10643157949. The next prime is 10643157983. The reversal of 10643157961 is 16975134601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10638684736 + 4473225 = 103144^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 10643157961 - 2⁹ = 10643157449 is a prime.

It is a super-2 number, since 2×10643157961² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10643157991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5321578980 + 5321578981.

It is an arithmetic number, because the mean of its divisors is an integer number (5321578981).

Almost surely, 2^10643157961 is an apocalyptic number.

It is an amenable number.

10643157961 is a deficient number, since it is larger than the sum of its proper divisors (1).

10643157961 is an equidigital number, since it uses as much as digits as its factorization.

10643157961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 10643157961 in words is "ten billion, six hundred forty-three million, one hundred fifty-seven thousand, nine hundred sixty-one".