18947765253690 has 768 divisors, whose sum is σ = 65507194368000. Its totient is φ = 3858906562560.

The previous prime is 18947765253653. The next prime is 18947765253701. The reversal of 18947765253690 is 9635256774981.

18947765253690 is a `hidden beast` number, since 1 + 8 + 9 + 4 + 7 + 7 + 6 + 525 + 3 + 6 + 90 = 666.

It is a super-2 number, since 2×18947765253690² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 2180656866 + ... + 2180665554.

It is an arithmetic number, because the mean of its divisors is an integer number (85295826000).

It is a 1-persistent number, because it is pandigital, but 2⋅18947765253690 = 37895530507380 is not.

Almost surely, 2^{18947765253690} is an apocalyptic number.

18947765253690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18947765253690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32753597184000).

18947765253690 is an abundant number, since it is smaller than the sum of its proper divisors (46559429114310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18947765253690 is a wasteful number, since it uses less digits than its factorization.

18947765253690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9172 (or 9159 counting only the distinct ones).

The product of its (nonzero) digits is 685843200, while the sum is 72.

The spelling of 18947765253690 in words is "eighteen trillion, nine hundred forty-seven billion, seven hundred sixty-five million, two hundred fifty-three thousand, six hundred ninety".