19662786623902 has 4 divisors (see below), whose sum is σ = 29494179935856. Its totient is φ = 9831393311950.

The previous prime is 19662786623873. The next prime is 19662786623959. The reversal of 19662786623902 is 20932668726691.

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

It is a super-2 number, since 2×19662786623902² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4915696655974 + ... + 4915696655977.

It is an arithmetic number, because the mean of its divisors is an integer number (7373544983964).

Almost surely, 2^{19662786623902} is an apocalyptic number.

19662786623902 is a deficient number, since it is larger than the sum of its proper divisors (9831393311954).

19662786623902 is an equidigital number, since it uses as much as digits as its factorization.

19662786623902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9831393311953.

The product of its (nonzero) digits is 141087744, while the sum is 67.

The spelling of 19662786623902 in words is "nineteen trillion, six hundred sixty-two billion, seven hundred eighty-six million, six hundred twenty-three thousand, nine hundred two".