155611812 has 48 divisors (see below), whose sum is σ = 388100160. Its totient is φ = 48356352.

The previous prime is 155611801. The next prime is 155611817. The reversal of 155611812 is 218116551.

It is a self number, because there is not a number n which added to its sum of digits gives 155611812.

It is not an unprimeable number, because it can be changed into a prime (155611817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18264 + ... + 25392.

It is an arithmetic number, because the mean of its divisors is an integer number (8085420).

Almost surely, 2^155611812 is an apocalyptic number.

155611812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155611812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194050080).

155611812 is an abundant number, since it is smaller than the sum of its proper divisors (232488348).

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

155611812 is a wasteful number, since it uses less digits than its factorization.

155611812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7260 (or 7258 counting only the distinct ones).

The product of its digits is 2400, while the sum is 30.

The square root of 155611812 is about 12474.4463604603. The cubic root of 155611812 is about 537.8743735459.

The spelling of 155611812 in words is "one hundred fifty-five million, six hundred eleven thousand, eight hundred twelve".