1401561110561 has 2 divisors, whose sum is σ = 1401561110562. Its totient is φ = 1401561110560.

The previous prime is 1401561110539. The next prime is 1401561110591. The reversal of 1401561110561 is 1650111651041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1238713350625 + 162847759936 = 1112975^2 + 403544^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401561110561 - 2²⁶ = 1401494001697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1401561110591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700780555280 + 700780555281.

It is an arithmetic number, because the mean of its divisors is an integer number (700780555281).

Almost surely, 2^{1401561110561} is an apocalyptic number.

It is an amenable number.

1401561110561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401561110561 is an equidigital number, since it uses as much as digits as its factorization.

1401561110561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 32.

The spelling of 1401561110561 in words is "one trillion, four hundred one billion, five hundred sixty-one million, one hundred ten thousand, five hundred sixty-one".