155681556 has 12 divisors (see below), whose sum is σ = 363256992. Its totient is φ = 51893848.

The previous prime is 155681527. The next prime is 155681557. The reversal of 155681556 is 655186551.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×155681556² = 48473493757162272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155681557) by changing a digit.

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, 6486720 + ... + 6486743.

It is an arithmetic number, because the mean of its divisors is an integer number (30271416).

Almost surely, 2^155681556 is an apocalyptic number.

It is an amenable number.

155681556 is an abundant number, since it is smaller than the sum of its proper divisors (207575436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155681556 is a wasteful number, since it uses less digits than its factorization.

155681556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973470 (or 12973468 counting only the distinct ones).

The product of its digits is 180000, while the sum is 42.

The square root of 155681556 is about 12477.2415220673. The cubic root of 155681556 is about 537.9547185762.

The spelling of 155681556 in words is "one hundred fifty-five million, six hundred eighty-one thousand, five hundred fifty-six".