180199023406 has 4 divisors (see below), whose sum is σ = 270298535112. Its totient is φ = 90099511702.

The previous prime is 180199023397. The next prime is 180199023437. The reversal of 180199023406 is 604320991081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×180199023406² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45049755850 + ... + 45049755853.

It is an arithmetic number, because the mean of its divisors is an integer number (67574633778).

Almost surely, 2^180199023406 is an apocalyptic number.

180199023406 is a deficient number, since it is larger than the sum of its proper divisors (90099511706).

180199023406 is an equidigital number, since it uses as much as digits as its factorization.

180199023406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90099511705.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 180199023406 in words is "one hundred eighty billion, one hundred ninety-nine million, twenty-three thousand, four hundred six".