1125561732761 has 8 divisors (see below), whose sum is σ = 1143511413000. Its totient is φ = 1107750660480.

The previous prime is 1125561732751. The next prime is 1125561732769. The reversal of 1125561732761 is 1672371655211.

It can be written as a sum of positive squares in 4 ways, for example, as 305097150736 + 820464582025 = 552356^2 + 905795^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1125561732761 - 2¹⁰ = 1125561731737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125561732769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34635620 + ... + 34668101.

It is an arithmetic number, because the mean of its divisors is an integer number (142938926625).

Almost surely, 2^{1125561732761} is an apocalyptic number.

It is an amenable number.

1125561732761 is a deficient number, since it is larger than the sum of its proper divisors (17949680239).

1125561732761 is a wasteful number, since it uses less digits than its factorization.

1125561732761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69303979.

The product of its digits is 529200, while the sum is 47.

The spelling of 1125561732761 in words is "one trillion, one hundred twenty-five billion, five hundred sixty-one million, seven hundred thirty-two thousand, seven hundred sixty-one".