1643015113452 has 18 divisors (see below), whose sum is σ = 4153177092428. Its totient is φ = 547671704472.

The previous prime is 1643015113409. The next prime is 1643015113463. The reversal of 1643015113452 is 2543115103461.

1643015113452 is a `hidden beast` number, since 1 + 6 + 4 + 301 + 5 + 1 + 1 + 345 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 45639308707 = 1643015113452 / (1 + 6 + 4 + 3 + 0 + 1 + 5 + 1 + 1 + 3 + 4 + 5 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22819654318 + ... + 22819654389.

Almost surely, 2^{1643015113452} is an apocalyptic number.

1643015113452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1643015113452 is an abundant number, since it is smaller than the sum of its proper divisors (2510161978976).

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

1643015113452 is a wasteful number, since it uses less digits than its factorization.

1643015113452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45639308717 (or 45639308712 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Subtracting 1643015113452 from its reverse (2543115103461), we obtain a palindrome (900099990009).

The spelling of 1643015113452 in words is "one trillion, six hundred forty-three billion, fifteen million, one hundred thirteen thousand, four hundred fifty-two".