166519249919 has 8 divisors (see below), whose sum is σ = 182745134208. Its totient is φ = 150474660760.

The previous prime is 166519249907. The next prime is 166519249921. The reversal of 166519249919 is 919942915661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166519249919 is a prime.

It is a super-2 number, since 2×166519249919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166519249999) 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, 45321857 + ... + 45325530.

It is an arithmetic number, because the mean of its divisors is an integer number (22843141776).

Almost surely, 2^166519249919 is an apocalyptic number.

166519249919 is a deficient number, since it is larger than the sum of its proper divisors (16225884289).

166519249919 is a wasteful number, since it uses less digits than its factorization.

166519249919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90647565.

The product of its digits is 9447840, while the sum is 62.

The spelling of 166519249919 in words is "one hundred sixty-six billion, five hundred nineteen million, two hundred forty-nine thousand, nine hundred nineteen".