661126474017 has 12 divisors (see below), whose sum is σ = 954967552084. Its totient is φ = 440747710560.

The previous prime is 661126473989. The next prime is 661126474033. The reversal of 661126474017 is 710474621166.

661126474017 is a `hidden beast` number, since 6 + 611 + 26 + 4 + 7 + 4 + 0 + 1 + 7 = 666.

661126474017 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 603300172176 + 57826301841 = 776724^2 + 240471^2 .

It is not a de Polignac number, because 661126474017 - 2³⁰ = 660052732193 is a prime.

It is a super-2 number, since 2×661126474017² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661126474087) 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, 2033667 + ... + 2336247.

Almost surely, 2^661126474017 is an apocalyptic number.

It is an amenable number.

661126474017 is a deficient number, since it is larger than the sum of its proper divisors (293841078067).

661126474017 is a wasteful number, since it uses less digits than its factorization.

661126474017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545360 (or 545357 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 661126474017 in words is "six hundred sixty-one billion, one hundred twenty-six million, four hundred seventy-four thousand, seventeen".