166344402461 has 4 divisors (see below), whose sum is σ = 166575758400. Its totient is φ = 166113046524.

The previous prime is 166344402449. The next prime is 166344402463. The reversal of 166344402461 is 164204443661.

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-166344402461 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 (166344402463) 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, 115676891 + ... + 115678328.

It is an arithmetic number, because the mean of its divisors is an integer number (41643939600).

Almost surely, 2^166344402461 is an apocalyptic number.

It is an amenable number.

166344402461 is a deficient number, since it is larger than the sum of its proper divisors (231355939).

166344402461 is an equidigital number, since it uses as much as digits as its factorization.

166344402461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231355938.

The product of its (nonzero) digits is 331776, while the sum is 41.

The spelling of 166344402461 in words is "one hundred sixty-six billion, three hundred forty-four million, four hundred two thousand, four hundred sixty-one".