1987551554487 has 8 divisors (see below), whose sum is σ = 2650679512320. Its totient is φ = 1324728983160.

The previous prime is 1987551554473. The next prime is 1987551554489. The reversal of 1987551554487 is 7844551557891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1987551554487 - 2²³ = 1987543165879 is a prime.

It is a super-2 number, since 2×1987551554487² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987551554489) 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, 76331439 + ... + 76357472.

It is an arithmetic number, because the mean of its divisors is an integer number (331334939040).

Almost surely, 2^{1987551554487} is an apocalyptic number.

1987551554487 is a deficient number, since it is larger than the sum of its proper divisors (663127957833).

1987551554487 is a wasteful number, since it uses less digits than its factorization.

1987551554487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152693253.

The product of its digits is 282240000, while the sum is 69.

The spelling of 1987551554487 in words is "one trillion, nine hundred eighty-seven billion, five hundred fifty-one million, five hundred fifty-four thousand, four hundred eighty-seven".