10021775661 has 12 divisors (see below), whose sum is σ = 14510452320. Its totient is φ = 6665235720.

The previous prime is 10021775657. The next prime is 10021775683. The reversal of 10021775661 is 16657712001.

10021775661 is a `hidden beast` number, since 1 + 0 + 0 + 21 + 77 + 566 + 1 = 666.

It is not a de Polignac number, because 10021775661 - 2² = 10021775657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021775651) 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, 1325025 + ... + 1332566.

It is an arithmetic number, because the mean of its divisors is an integer number (1209204360).

Almost surely, 2^10021775661 is an apocalyptic number.

It is an amenable number.

10021775661 is a deficient number, since it is larger than the sum of its proper divisors (4488676659).

10021775661 is a wasteful number, since it uses less digits than its factorization.

10021775661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658016 (or 2658013 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 10021775661 in words is "ten billion, twenty-one million, seven hundred seventy-five thousand, six hundred sixty-one".