1225555550 has 48 divisors (see below), whose sum is σ = 2403274752. Its totient is φ = 464287200.

The previous prime is 1225555549. The next prime is 1225555553. The reversal of 1225555550 is 555555221.

It is a super-2 number, since 2×1225555550² = 3003972812271605000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1225555550.

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 23 ways as a sum of consecutive naturals, for example, 64439 + ... + 81261.

It is an arithmetic number, because the mean of its divisors is an integer number (50068224).

Almost surely, 2^1225555550 is an apocalyptic number.

1225555550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225555550 is a deficient number, since it is larger than the sum of its proper divisors (1177719202).

1225555550 is a wasteful number, since it uses less digits than its factorization.

1225555550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16913 (or 16908 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 35.

The square root of 1225555550 is about 35007.9355289626. The cubic root of 1225555550 is about 1070.1492061997.

The spelling of 1225555550 in words is "one billion, two hundred twenty-five million, five hundred fifty-five thousand, five hundred fifty".