1555116401 has 8 divisors (see below), whose sum is σ = 1631130240. Its totient is φ = 1480891248.

The previous prime is 1555116383. The next prime is 1555116443. The reversal of 1555116401 is 1046115551.

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 1555116401 - 2¹⁰ = 1555115377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555116601) 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, 445391 + ... + 448868.

It is an arithmetic number, because the mean of its divisors is an integer number (203891280).

Almost surely, 2^1555116401 is an apocalyptic number.

It is an amenable number.

1555116401 is a deficient number, since it is larger than the sum of its proper divisors (76013839).

1555116401 is an equidigital number, since it uses as much as digits as its factorization.

1555116401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894343.

The product of its (nonzero) digits is 3000, while the sum is 29.

The square root of 1555116401 is about 39434.9641942274. The cubic root of 1555116401 is about 1158.5665013947.

The spelling of 1555116401 in words is "one billion, five hundred fifty-five million, one hundred sixteen thousand, four hundred one".