1555349645665 has 32 divisors (see below), whose sum is σ = 1937980541952. Its totient is φ = 1197050400000.

The previous prime is 1555349645657. The next prime is 1555349645713. The reversal of 1555349645665 is 5665469435551.

It is a happy number.

It is not a de Polignac number, because 1555349645665 - 2³ = 1555349645657 is a prime.

It is a super-2 number, since 2×1555349645665² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1555349645597 and 1555349645606.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91198279 + ... + 91215331.

It is an arithmetic number, because the mean of its divisors is an integer number (60561891936).

Almost surely, 2^{1555349645665} is an apocalyptic number.

It is an amenable number.

1555349645665 is a deficient number, since it is larger than the sum of its proper divisors (382630896287).

1555349645665 is a wasteful number, since it uses less digits than its factorization.

1555349645665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20521.

The product of its digits is 291600000, while the sum is 64.

The spelling of 1555349645665 in words is "one trillion, five hundred fifty-five billion, three hundred forty-nine million, six hundred forty-five thousand, six hundred sixty-five".