1225555558 has 8 divisors (see below), whose sum is σ = 1865771352. Its totient is φ = 603631776.

The previous prime is 1225555553. The next prime is 1225555579. The reversal of 1225555558 is 8555555221.

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

It is a super-3 number, since 3×1225555558³ (a number of 28 digits) contains 333 as substring.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225555553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4572835 + ... + 4573102.

It is an arithmetic number, because the mean of its divisors is an integer number (233221419).

Almost surely, 2^1225555558 is an apocalyptic number.

1225555558 is a deficient number, since it is larger than the sum of its proper divisors (640215794).

1225555558 is an equidigital number, since it uses as much as digits as its factorization.

1225555558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9146006.

The product of its digits is 500000, while the sum is 43.

The square root of 1225555558 is about 35007.9356432224. The cubic root of 1225555558 is about 1070.1492085282.

The spelling of 1225555558 in words is "one billion, two hundred twenty-five million, five hundred fifty-five thousand, five hundred fifty-eight".