1655787161599 has 8 divisors (see below), whose sum is σ = 1656521829248. Its totient is φ = 1655052665760.

The previous prime is 1655787161557. The next prime is 1655787161627. The reversal of 1655787161599 is 9951617875561.

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 1655787161599 - 2¹⁹ = 1655786637311 is a prime.

It is a super-2 number, since 2×1655787161599² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655787161999) 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, 21578569 + ... + 21655165.

It is an arithmetic number, because the mean of its divisors is an integer number (207065228656).

Almost surely, 2^{1655787161599} is an apocalyptic number.

1655787161599 is a deficient number, since it is larger than the sum of its proper divisors (734667649).

1655787161599 is an equidigital number, since it uses as much as digits as its factorization.

1655787161599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85905.

The product of its digits is 142884000, while the sum is 70.

The spelling of 1655787161599 in words is "one trillion, six hundred fifty-five billion, seven hundred eighty-seven million, one hundred sixty-one thousand, five hundred ninety-nine".