1987797423563 has 8 divisors (see below), whose sum is σ = 2271780901632. Its totient is φ = 1703817049896.

The previous prime is 1987797423517. The next prime is 1987797423611. The reversal of 1987797423563 is 3653247977891.

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 1987797423563 - 2²² = 1987793229259 is a prime.

It is a super-2 number, since 2×1987797423563² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987797423463) 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, 812906 + ... + 2153232.

It is an arithmetic number, because the mean of its divisors is an integer number (283972612704).

Almost surely, 2^{1987797423563} is an apocalyptic number.

1987797423563 is a deficient number, since it is larger than the sum of its proper divisors (283983478069).

1987797423563 is a wasteful number, since it uses less digits than its factorization.

1987797423563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552201.

The product of its digits is 480090240, while the sum is 71.

The spelling of 1987797423563 in words is "one trillion, nine hundred eighty-seven billion, seven hundred ninety-seven million, four hundred twenty-three thousand, five hundred sixty-three".