797666661 has 36 divisors (see below), whose sum is σ = 1270160736. Its totient is φ = 478396800.

The previous prime is 797666659. The next prime is 797666671. The reversal of 797666661 is 166666797.

It is not a de Polignac number, because 797666661 - 2¹ = 797666659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 797666598 and 797666607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797666621) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1263816 + ... + 1264446.

Almost surely, 2^797666661 is an apocalyptic number.

It is an amenable number.

797666661 is a deficient number, since it is larger than the sum of its proper divisors (472494075).

797666661 is a wasteful number, since it uses less digits than its factorization.

797666661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 758 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 797666661 is about 28242.9931310405. The cubic root of 797666661 is about 927.4143544789.

The spelling of 797666661 in words is "seven hundred ninety-seven million, six hundred sixty-six thousand, six hundred sixty-one".