90861078725161 has 2 divisors, whose sum is σ = 90861078725162. Its totient is φ = 90861078725160.

The previous prime is 90861078725147. The next prime is 90861078725237. The reversal of 90861078725161 is 16152787016809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82282242753936 + 8578835971225 = 9070956^2 + 2928965^2 .

It is a cyclic number.

It is not a de Polignac number, because 90861078725161 - 2¹¹ = 90861078723113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90861078725161.

It is not a weakly prime, because it can be changed into another prime (90861078720161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45430539362580 + 45430539362581.

It is an arithmetic number, because the mean of its divisors is an integer number (45430539362581).

Almost surely, 2^{90861078725161} is an apocalyptic number.

It is an amenable number.

90861078725161 is a deficient number, since it is larger than the sum of its proper divisors (1).

90861078725161 is an equidigital number, since it uses as much as digits as its factorization.

90861078725161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10160640, while the sum is 61.

The spelling of 90861078725161 in words is "ninety trillion, eight hundred sixty-one billion, seventy-eight million, seven hundred twenty-five thousand, one hundred sixty-one".