865770043010661 has 8 divisors (see below), whose sum is σ = 1282622285941760. Its totient is φ = 577180028673756.

The previous prime is 865770043010657. The next prime is 865770043010689. The reversal of 865770043010661 is 166010340077568.

865770043010661 is a `hidden beast` number, since 8 + 6 + 577 + 0 + 0 + 4 + 3 + 0 + 1 + 0 + 6 + 61 = 666.

It is not a de Polignac number, because 865770043010661 - 2² = 865770043010657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 865770043010598 and 865770043010607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865770043012661) 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, 16032778574245 + ... + 16032778574298.

It is an arithmetic number, because the mean of its divisors is an integer number (160327785742720).

Almost surely, 2^{865770043010661} is an apocalyptic number.

It is an amenable number.

865770043010661 is a deficient number, since it is larger than the sum of its proper divisors (416852242931099).

865770043010661 is a wasteful number, since it uses less digits than its factorization.

865770043010661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32065557148552 (or 32065557148546 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 865770043010661 in words is "eight hundred sixty-five trillion, seven hundred seventy billion, forty-three million, ten thousand, six hundred sixty-one".