1551115555 has 8 divisors (see below), whose sum is σ = 2030551344. Its totient is φ = 1128084000.

The previous prime is 1551115529. The next prime is 1551115571. The reversal of 1551115555 is 5555111551.

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

It is not a de Polignac number, because 1551115555 - 2⁷ = 1551115427 is a prime.

It is a nude number because it is divisible by every one of its digits.

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 1551115555.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14100996 + ... + 14101105.

It is an arithmetic number, because the mean of its divisors is an integer number (253818918).

Almost surely, 2^1551115555 is an apocalyptic number.

1551115555 is a deficient number, since it is larger than the sum of its proper divisors (479435789).

1551115555 is a wasteful number, since it uses less digits than its factorization.

1551115555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28202117.

The product of its digits is 15625, while the sum is 34.

The square root of 1551115555 is about 39384.2043844991. The cubic root of 1551115555 is about 1157.5721006172.

The spelling of 1551115555 in words is "one billion, five hundred fifty-one million, one hundred fifteen thousand, five hundred fifty-five".