1620432827778 has 8 divisors (see below), whose sum is σ = 3240865655568. Its totient is φ = 540144275924.

The previous prime is 1620432827771. The next prime is 1620432827791. The reversal of 1620432827778 is 8777282340261.

It is a sphenic number, since it is the product of 3 distinct primes.

1620432827778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1620432827771) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 135036068976 + ... + 135036068987.

It is an arithmetic number, because the mean of its divisors is an integer number (405108206946).

Almost surely, 2^{1620432827778} is an apocalyptic number.

1620432827778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1620432827778 is a wasteful number, since it uses less digits than its factorization.

1620432827778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270072137968.

The product of its (nonzero) digits is 12644352, while the sum is 57.

The spelling of 1620432827778 in words is "one trillion, six hundred twenty billion, four hundred thirty-two million, eight hundred twenty-seven thousand, seven hundred seventy-eight".