1897806616563 has 48 divisors (see below), whose sum is σ = 3040015720448. Its totient is φ = 1045863403200.

The previous prime is 1897806616523. The next prime is 1897806616591. The reversal of 1897806616563 is 3656166087981.

It is not a de Polignac number, because 1897806616563 - 2²¹ = 1897804519411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1897806616494 and 1897806616503.

It is not an unprimeable number, because it can be changed into a prime (1897806616513) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2685043 + ... + 3317388.

Almost surely, 2^{1897806616563} is an apocalyptic number.

1897806616563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1897806616563 is a deficient number, since it is larger than the sum of its proper divisors (1142209103885).

1897806616563 is a wasteful number, since it uses less digits than its factorization.

1897806616563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002536 (or 6002525 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 66.

The spelling of 1897806616563 in words is "one trillion, eight hundred ninety-seven billion, eight hundred six million, six hundred sixteen thousand, five hundred sixty-three".