155668812 has 24 divisors (see below), whose sum is σ = 391168176. Its totient is φ = 47898048.

The previous prime is 155668811. The next prime is 155668823. The reversal of 155668812 is 218866551.

It is not an unprimeable number, because it can be changed into a prime (155668811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498783 + ... + 499094.

It is an arithmetic number, because the mean of its divisors is an integer number (16298674).

Almost surely, 2^155668812 is an apocalyptic number.

155668812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155668812 is an abundant number, since it is smaller than the sum of its proper divisors (235499364).

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

155668812 is a wasteful number, since it uses less digits than its factorization.

155668812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997897 (or 997895 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The square root of 155668812 is about 12476.7308218139. The cubic root of 155668812 is about 537.9400392908.

The spelling of 155668812 in words is "one hundred fifty-five million, six hundred sixty-eight thousand, eight hundred twelve".