1620385566899 has 8 divisors (see below), whose sum is σ = 1801046050992. Its totient is φ = 1445283867040.

The previous prime is 1620385566887. The next prime is 1620385566941. The reversal of 1620385566899 is 9986655830261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620385566899 - 2⁴ = 1620385566883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620385566829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389695444 + ... + 1389696609.

It is an arithmetic number, because the mean of its divisors is an integer number (225130756374).

Almost surely, 2^{1620385566899} is an apocalyptic number.

1620385566899 is a deficient number, since it is larger than the sum of its proper divisors (180660484093).

1620385566899 is a wasteful number, since it uses less digits than its factorization.

1620385566899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779392117.

The product of its (nonzero) digits is 167961600, while the sum is 68.

The spelling of 1620385566899 in words is "one trillion, six hundred twenty billion, three hundred eighty-five million, five hundred sixty-six thousand, eight hundred ninety-nine".