166202363202661 has 4 divisors (see below), whose sum is σ = 166599027554400. Its totient is φ = 165805698850924.

The previous prime is 166202363202637. The next prime is 166202363202671.

166202363202661 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166202363202661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166202363202671) 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, 198332175241 + ... + 198332176078.

It is an arithmetic number, because the mean of its divisors is an integer number (41649756888600).

Almost surely, 2^{166202363202661} is an apocalyptic number.

It is an amenable number.

166202363202661 is a deficient number, since it is larger than the sum of its proper divisors (396664351739).

166202363202661 is an equidigital number, since it uses as much as digits as its factorization.

166202363202661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396664351738.

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 166202363202661 in words is "one hundred sixty-six trillion, two hundred two billion, three hundred sixty-three million, two hundred two thousand, six hundred sixty-one".