166696696661 has 4 divisors (see below), whose sum is σ = 181850941824. Its totient is φ = 151542451500.

The previous prime is 166696696657. The next prime is 166696696679.

166696696661 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166696696661 - 2² = 166696696657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166696696591 and 166696696600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166696696651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7577122565 + ... + 7577122586.

It is an arithmetic number, because the mean of its divisors is an integer number (45462735456).

Almost surely, 2^166696696661 is an apocalyptic number.

166696696661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166696696661 is a deficient number, since it is larger than the sum of its proper divisors (15154245163).

166696696661 is a wasteful number, since it uses less digits than its factorization.

166696696661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15154245162.

The product of its digits is 136048896, while the sum is 68.

The spelling of 166696696661 in words is "one hundred sixty-six billion, six hundred ninety-six million, six hundred ninety-six thousand, six hundred sixty-one".