1620636063391 has 4 divisors (see below), whose sum is σ = 1620650109784. Its totient is φ = 1620622017000.

The previous prime is 1620636063281. The next prime is 1620636063401. The reversal of 1620636063391 is 1933606360261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1620636063391 - 2²⁷ = 1620501845663 is a prime.

It is a super-2 number, since 2×1620636063391² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620636066391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6848685 + ... + 7081366.

It is an arithmetic number, because the mean of its divisors is an integer number (405162527446).

Almost surely, 2^{1620636063391} is an apocalyptic number.

1620636063391 is a deficient number, since it is larger than the sum of its proper divisors (14046393).

1620636063391 is a wasteful number, since it uses less digits than its factorization.

1620636063391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14046392.

The product of its (nonzero) digits is 629856, while the sum is 46.

The spelling of 1620636063391 in words is "one trillion, six hundred twenty billion, six hundred thirty-six million, sixty-three thousand, three hundred ninety-one".