1012123436661 has 12 divisors (see below), whose sum is σ = 1461969314988. Its totient is φ = 674742847104.

The previous prime is 1012123436581. The next prime is 1012123436671. The reversal of 1012123436661 is 1666343212101.

1012123436661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 56314137636 + 955809299025 = 237306^2 + 977655^2 .

It is not a de Polignac number, because 1012123436661 - 2¹⁰ = 1012123435637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012123436671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 687901 + ... + 1580333.

It is an arithmetic number, because the mean of its divisors is an integer number (121830776249).

Almost surely, 2^{1012123436661} is an apocalyptic number.

It is an amenable number.

1012123436661 is a deficient number, since it is larger than the sum of its proper divisors (449845878327).

1012123436661 is a wasteful number, since it uses less digits than its factorization.

1012123436661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018452 (or 1018449 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Adding to 1012123436661 its reverse (1666343212101), we get a palindrome (2678466648762).

The spelling of 1012123436661 in words is "one trillion, twelve billion, one hundred twenty-three million, four hundred thirty-six thousand, six hundred sixty-one".