561261862245461 has 32 divisors (see below), whose sum is σ = 658433200656000. Its totient is φ = 473718614277888.

The previous prime is 561261862245451. The next prime is 561261862245541. The reversal of 561261862245461 is 164542268162165.

It is not a de Polignac number, because 561261862245461 - 2⁴² = 556863815734357 is a prime.

It is a super-2 number, since 2×561261862245461² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561261862245461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561261862245421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4616075 + ... + 33820583.

It is an arithmetic number, because the mean of its divisors is an integer number (20576037520500).

Almost surely, 2^{561261862245461} is an apocalyptic number.

It is an amenable number.

561261862245461 is a deficient number, since it is larger than the sum of its proper divisors (97171338410539).

561261862245461 is a wasteful number, since it uses less digits than its factorization.

561261862245461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29207253.

The product of its digits is 33177600, while the sum is 59.

The spelling of 561261862245461 in words is "five hundred sixty-one trillion, two hundred sixty-one billion, eight hundred sixty-two million, two hundred forty-five thousand, four hundred sixty-one".