1866965927904 has 576 divisors, whose sum is σ = 7093784355840. Its totient is φ = 451301621760.

The previous prime is 1866965927903. The next prime is 1866965927909. The reversal of 1866965927904 is 4097295696681.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866965927903) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18822312 + ... + 18921240.

It is an arithmetic number, because the mean of its divisors is an integer number (12315597840).

Almost surely, 2^{1866965927904} is an apocalyptic number.

1866965927904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866965927904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3546892177920).

1866965927904 is an abundant number, since it is smaller than the sum of its proper divisors (5226818427936).

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

1866965927904 is a wasteful number, since it uses less digits than its factorization.

1866965927904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99023 (or 99012 counting only the distinct ones).

The product of its (nonzero) digits is 352719360, while the sum is 72.

The spelling of 1866965927904 in words is "one trillion, eight hundred sixty-six billion, nine hundred sixty-five million, nine hundred twenty-seven thousand, nine hundred four".