17551620488987 has 8 divisors (see below), whose sum is σ = 19141007739840. Its totient is φ = 15996413609280.

The previous prime is 17551620488921. The next prime is 17551620488989. The reversal of 17551620488987 is 78988402615571.

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

It is not a de Polignac number, because 17551620488987 - 2²² = 17551616294683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17551620488987.

It is not an unprimeable number, because it can be changed into a prime (17551620488989) 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, 8545091714 + ... + 8545093767.

It is an arithmetic number, because the mean of its divisors is an integer number (2392625967480).

Almost surely, 2^{17551620488987} is an apocalyptic number.

17551620488987 is a deficient number, since it is larger than the sum of its proper divisors (1589387250853).

17551620488987 is a wasteful number, since it uses less digits than its factorization.

17551620488987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17090185573.

The product of its (nonzero) digits is 270950400, while the sum is 71.

The spelling of 17551620488987 in words is "seventeen trillion, five hundred fifty-one billion, six hundred twenty million, four hundred eighty-eight thousand, nine hundred eighty-seven".