861126501601 has 2 divisors, whose sum is σ = 861126501602. Its totient is φ = 861126501600.

The previous prime is 861126501593. The next prime is 861126501629. The reversal of 861126501601 is 106105621168.

861126501601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 821785762576 + 39340739025 = 906524^2 + 198345^2 .

It is a cyclic number.

It is not a de Polignac number, because 861126501601 - 2³ = 861126501593 is a prime.

It is not a weakly prime, because it can be changed into another prime (861126501691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430563250800 + 430563250801.

It is an arithmetic number, because the mean of its divisors is an integer number (430563250801).

Almost surely, 2^861126501601 is an apocalyptic number.

It is an amenable number.

861126501601 is a deficient number, since it is larger than the sum of its proper divisors (1).

861126501601 is an equidigital number, since it uses as much as digits as its factorization.

861126501601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 861126501601 in words is "eight hundred sixty-one billion, one hundred twenty-six million, five hundred one thousand, six hundred one".