155551556 has 12 divisors (see below), whose sum is σ = 286542480. Its totient is φ = 73682280.

The previous prime is 155551549. The next prime is 155551577. The reversal of 155551556 is 655155551.

It is a happy number.

It is a super-2 number, since 2×155551556² = 48392573148042272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1023290 + ... + 1023441.

It is an arithmetic number, because the mean of its divisors is an integer number (23878540).

Almost surely, 2^155551556 is an apocalyptic number.

It is an amenable number.

155551556 is a deficient number, since it is larger than the sum of its proper divisors (130990924).

155551556 is a wasteful number, since it uses less digits than its factorization.

155551556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046754 (or 2046752 counting only the distinct ones).

The product of its digits is 93750, while the sum is 38.

The square root of 155551556 is about 12472.0309492881. The cubic root of 155551556 is about 537.8049393514.

The spelling of 155551556 in words is "one hundred fifty-five million, five hundred fifty-one thousand, five hundred fifty-six".