181970451836 has 12 divisors (see below), whose sum is σ = 318451701120. Its totient is φ = 90984251520.

The previous prime is 181970451829. The next prime is 181970451841. The reversal of 181970451836 is 638154079181.

181970451836 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181970451836² (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 in 3 ways as a sum of consecutive naturals, for example, 323045 + ... + 684323.

It is an arithmetic number, because the mean of its divisors is an integer number (26537641760).

Almost surely, 2^181970451836 is an apocalyptic number.

It is an amenable number.

181970451836 is a deficient number, since it is larger than the sum of its proper divisors (136481249284).

181970451836 is a wasteful number, since it uses less digits than its factorization.

181970451836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487204 (or 487202 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 181970451836 in words is "one hundred eighty-one billion, nine hundred seventy million, four hundred fifty-one thousand, eight hundred thirty-six".