166209241949 has 8 divisors (see below), whose sum is σ = 169633789920. Its totient is φ = 162795380176.

The previous prime is 166209241943. The next prime is 166209241967. The reversal of 166209241949 is 949142902661.

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 166209241949 - 2¹² = 166209237853 is a prime.

It is a super-2 number, since 2×166209241949² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166209241949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166209241943) 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, 2640119 + ... + 2702340.

It is an arithmetic number, because the mean of its divisors is an integer number (21204223740).

Almost surely, 2^166209241949 is an apocalyptic number.

It is an amenable number.

166209241949 is a deficient number, since it is larger than the sum of its proper divisors (3424547971).

166209241949 is an equidigital number, since it uses as much as digits as its factorization.

166209241949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343099.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 166209241949 in words is "one hundred sixty-six billion, two hundred nine million, two hundred forty-one thousand, nine hundred forty-nine".