1620886453917 has 8 divisors (see below), whose sum is σ = 2161344596640. Its totient is φ = 1080509640240.

The previous prime is 1620886453913. The next prime is 1620886453939. The reversal of 1620886453917 is 7193546880261.

It is a happy number.

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

It is not a de Polignac number, because 1620886453917 - 2² = 1620886453913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620886453913) 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, 20285742 + ... + 20365487.

It is an arithmetic number, because the mean of its divisors is an integer number (270168074580).

It is a 1-persistent number, because it is pandigital, but 2⋅1620886453917 = 3241772907834 is not.

Almost surely, 2^{1620886453917} is an apocalyptic number.

It is an amenable number.

1620886453917 is a deficient number, since it is larger than the sum of its proper divisors (540458142723).

1620886453917 is a wasteful number, since it uses less digits than its factorization.

1620886453917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40664523.

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 1620886453917 in words is "one trillion, six hundred twenty billion, eight hundred eighty-six million, four hundred fifty-three thousand, nine hundred seventeen".