1986125560791 has 4 divisors (see below), whose sum is σ = 2648167414392. Its totient is φ = 1324083707192.

The previous prime is 1986125560781. The next prime is 1986125560817. The reversal of 1986125560791 is 1970655216891.

It is a happy number.

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 1986125560791 - 2²³ = 1986117172183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986125560711) 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, 331020926796 + ... + 331020926801.

It is an arithmetic number, because the mean of its divisors is an integer number (662041853598).

Almost surely, 2^{1986125560791} is an apocalyptic number.

1986125560791 is a deficient number, since it is larger than the sum of its proper divisors (662041853601).

1986125560791 is an equidigital number, since it uses as much as digits as its factorization.

1986125560791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662041853600.

The product of its (nonzero) digits is 8164800, while the sum is 60.

The spelling of 1986125560791 in words is "one trillion, nine hundred eighty-six billion, one hundred twenty-five million, five hundred sixty thousand, seven hundred ninety-one".