840498976661 has 16 divisors (see below), whose sum is σ = 855700167168. Its totient is φ = 825464908800.

The previous prime is 840498976651. The next prime is 840498976673. The reversal of 840498976661 is 166679894048.

840498976661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 840498976661 - 2²² = 840494782357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840498976591 and 840498976600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840498976651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5677421 + ... + 5823581.

It is an arithmetic number, because the mean of its divisors is an integer number (53481260448).

Almost surely, 2^840498976661 is an apocalyptic number.

It is an amenable number.

840498976661 is a deficient number, since it is larger than the sum of its proper divisors (15201190507).

840498976661 is a wasteful number, since it uses less digits than its factorization.

840498976661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146732.

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 840498976661 in words is "eight hundred forty billion, four hundred ninety-eight million, nine hundred seventy-six thousand, six hundred sixty-one".