102561055691 has 2 divisors, whose sum is σ = 102561055692. Its totient is φ = 102561055690.

The previous prime is 102561055637. The next prime is 102561055693. The reversal of 102561055691 is 196550165201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102561055691 - 2³⁰ = 101487313867 is a prime.

Together with 102561055693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102561055693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51280527845 + 51280527846.

It is an arithmetic number, because the mean of its divisors is an integer number (51280527846).

Almost surely, 2^102561055691 is an apocalyptic number.

102561055691 is a deficient number, since it is larger than the sum of its proper divisors (1).

102561055691 is an equidigital number, since it uses as much as digits as its factorization.

102561055691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 41.

The spelling of 102561055691 in words is "one hundred two billion, five hundred sixty-one million, fifty-five thousand, six hundred ninety-one".