661126027653 has 24 divisors (see below), whose sum is σ = 1175335161728. Its totient is φ = 348725816352.

The previous prime is 661126027651. The next prime is 661126027691. The reversal of 661126027653 is 356720621166.

661126027653 is a `hidden beast` number, since 6 + 611 + 2 + 6 + 0 + 27 + 6 + 5 + 3 = 666.

It is not a de Polignac number, because 661126027653 - 2¹ = 661126027651 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661126027599 and 661126027608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661126027651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403617025 + ... + 403618662.

Almost surely, 2^661126027653 is an apocalyptic number.

661126027653 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

661126027653 is a deficient number, since it is larger than the sum of its proper divisors (514209134075).

661126027653 is a wasteful number, since it uses less digits than its factorization.

661126027653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807235713 (or 807235710 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 661126027653 in words is "six hundred sixty-one billion, one hundred twenty-six million, twenty-seven thousand, six hundred fifty-three".