19806315203681 has 8 divisors (see below), whose sum is σ = 20926257508800. Its totient is φ = 18694123364880.

The previous prime is 19806315203663. The next prime is 19806315203687. The reversal of 19806315203681 is 18630251360891.

It is a happy number.

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 19806315203681 - 2⁶ = 19806315203617 is a prime.

It is a super-2 number, since 2×19806315203681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19806315203687) 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, 1937611325 + ... + 1937621546.

It is an arithmetic number, because the mean of its divisors is an integer number (2615782188600).

Almost surely, 2^{19806315203681} is an apocalyptic number.

It is an amenable number.

19806315203681 is a deficient number, since it is larger than the sum of its proper divisors (1119942305119).

19806315203681 is a wasteful number, since it uses less digits than its factorization.

19806315203681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875233159.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 19806315203681 in words is "nineteen trillion, eight hundred six billion, three hundred fifteen million, two hundred three thousand, six hundred eighty-one".