166609646761 has 8 divisors (see below), whose sum is σ = 171276394464. Its totient is φ = 161971618080.

The previous prime is 166609646743. The next prime is 166609646779. The reversal of 166609646761 is 167646906661.

It is an interprime number because it is at equal distance from previous prime (166609646743) and next prime (166609646779).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166609646761 - 2⁵ = 166609646729 is a prime.

It is a super-2 number, since 2×166609646761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166609646696 and 166609646705.

It is not an unprimeable number, because it can be changed into a prime (166609646741) 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, 7167991 + ... + 7191196.

It is an arithmetic number, because the mean of its divisors is an integer number (21409549308).

Almost surely, 2^166609646761 is an apocalyptic number.

It is an amenable number.

166609646761 is a deficient number, since it is larger than the sum of its proper divisors (4666747703).

166609646761 is a wasteful number, since it uses less digits than its factorization.

166609646761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14359511.

The product of its (nonzero) digits is 11757312, while the sum is 58.

The spelling of 166609646761 in words is "one hundred sixty-six billion, six hundred nine million, six hundred forty-six thousand, seven hundred sixty-one".