1005785555 has 16 divisors (see below), whose sum is σ = 1247962464. Its totient is φ = 777649920.

The previous prime is 1005785551. The next prime is 1005785579. The reversal of 1005785555 is 5555875001.

It is a happy number.

It is not a de Polignac number, because 1005785555 - 2² = 1005785551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005785551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 992 + ... + 44861.

It is an arithmetic number, because the mean of its divisors is an integer number (77997654).

Almost surely, 2^1005785555 is an apocalyptic number.

1005785555 is a deficient number, since it is larger than the sum of its proper divisors (242176909).

1005785555 is a wasteful number, since it uses less digits than its factorization.

1005785555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46006.

The product of its (nonzero) digits is 175000, while the sum is 41.

The square root of 1005785555 is about 31714.1223274427. The cubic root of 1005785555 is about 1001.9248110586.

The spelling of 1005785555 in words is "one billion, five million, seven hundred eighty-five thousand, five hundred fifty-five".