155406556 has 12 divisors (see below), whose sum is σ = 272119792. Its totient is φ = 77658048.

The previous prime is 155406551. The next prime is 155406557. The reversal of 155406556 is 655604551.

It is a super-2 number, since 2×155406556² = 48302395295562272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155406551) 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, 2880 + ... + 17863.

Almost surely, 2^155406556 is an apocalyptic number.

It is an amenable number.

155406556 is a deficient number, since it is larger than the sum of its proper divisors (116713236).

155406556 is a wasteful number, since it uses less digits than its factorization.

155406556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22620 (or 22618 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 155406556 is about 12466.2165872409. The cubic root of 155406556 is about 537.6377794262.

The spelling of 155406556 in words is "one hundred fifty-five million, four hundred six thousand, five hundred fifty-six".