18956186780690 has 8 divisors (see below), whose sum is σ = 34121136205260. Its totient is φ = 7582474712272.

The previous prime is 18956186780669. The next prime is 18956186780803. The reversal of 18956186780690 is 9608768165981.

It can be written as a sum of positive squares in 2 ways, for example, as 18785922438529 + 170264342161 = 4334273^2 + 412631^2 .

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

It is a super-2 number, since 2×18956186780690² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947809339025 + ... + 947809339044.

Almost surely, 2^{18956186780690} is an apocalyptic number.

18956186780690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18956186780690 is a deficient number, since it is larger than the sum of its proper divisors (15164949424570).

18956186780690 is a wasteful number, since it uses less digits than its factorization.

18956186780690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895618678076.

The product of its (nonzero) digits is 313528320, while the sum is 74.

The spelling of 18956186780690 in words is "eighteen trillion, nine hundred fifty-six billion, one hundred eighty-six million, seven hundred eighty thousand, six hundred ninety".