1987105161699 has 24 divisors (see below), whose sum is σ = 3284927316320. Its totient is φ = 1133887102848.

The previous prime is 1987105161659. The next prime is 1987105161709. The reversal of 1987105161699 is 9961615017891.

1987105161699 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 1 + 0 + 5 + 1 + 616 + 9 + 9 = 666.

It is not a de Polignac number, because 1987105161699 - 2²⁹ = 1986568290787 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987105161619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22198882 + ... + 22288215.

Almost surely, 2^{1987105161699} is an apocalyptic number.

1987105161699 is a deficient number, since it is larger than the sum of its proper divisors (1297822154621).

1987105161699 is a wasteful number, since it uses less digits than its factorization.

1987105161699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44487819 (or 44487816 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 63.

The spelling of 1987105161699 in words is "one trillion, nine hundred eighty-seven billion, one hundred five million, one hundred sixty-one thousand, six hundred ninety-nine".