155621168028 has 30 divisors (see below), whose sum is σ = 406824474056. Its totient is φ = 51873722568.

The previous prime is 155621168023. The next prime is 155621168041. The reversal of 155621168028 is 820861126551.

155621168028 is a `hidden beast` number, since 1 + 5 + 5 + 621 + 16 + 8 + 0 + 2 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155621168023) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 240155800 + ... + 240156447.

Almost surely, 2^155621168028 is an apocalyptic number.

155621168028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155621168028 is an abundant number, since it is smaller than the sum of its proper divisors (251203306028).

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

155621168028 is a wasteful number, since it uses less digits than its factorization.

155621168028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480312263 (or 480312252 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 155621168028 in words is "one hundred fifty-five billion, six hundred twenty-one million, one hundred sixty-eight thousand, twenty-eight".