1819642650642 has 160 divisors (see below), whose sum is σ = 4407796673280. Its totient is φ = 559347465600.

The previous prime is 1819642650629. The next prime is 1819642650659. The reversal of 1819642650642 is 2460562469181.

It is a happy number.

1819642650642 is a `hidden beast` number, since 1 + 8 + 1 + 96 + 4 + 2 + 6 + 506 + 42 = 666.

It is a super-2 number, since 2×1819642650642² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 75733843 + ... + 75757865.

It is an arithmetic number, because the mean of its divisors is an integer number (27548729208).

Almost surely, 2^{1819642650642} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1819642650642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203898336640).

1819642650642 is an abundant number, since it is smaller than the sum of its proper divisors (2588154022638).

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

1819642650642 is a wasteful number, since it uses less digits than its factorization.

1819642650642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24790 (or 24781 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 1819642650642 in words is "one trillion, eight hundred nineteen billion, six hundred forty-two million, six hundred fifty thousand, six hundred forty-two".