1555266225 has 12 divisors (see below), whose sum is σ = 2571373616. Its totient is φ = 829475280.

The previous prime is 1555266221. The next prime is 1555266247. The reversal of 1555266225 is 5226625551.

It is not a de Polignac number, because 1555266225 - 2² = 1555266221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555266221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10368367 + ... + 10368516.

Almost surely, 2^1555266225 is an apocalyptic number.

1555266225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1555266225 is a deficient number, since it is larger than the sum of its proper divisors (1016107391).

1555266225 is a wasteful number, since it uses less digits than its factorization.

1555266225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20736896 (or 20736891 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

The square root of 1555266225 is about 39436.8637825068. The cubic root of 1555266225 is about 1158.6037066469.

The spelling of 1555266225 in words is "one billion, five hundred fifty-five million, two hundred sixty-six thousand, two hundred twenty-five".