155212400000 has 288 divisors, whose sum is σ = 449647783200. Its totient is φ = 53208960000.

The previous prime is 155212399957. The next prime is 155212400027. The reversal of 155212400000 is 4212551.

It is a super-2 number, since 2×155212400000² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19596041 + ... + 19603959.

It is an arithmetic number, because the mean of its divisors is an integer number (1561277025).

Almost surely, 2^155212400000 is an apocalyptic number.

155212400000 is a gapful number since it is divisible by the number (10) 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 155212400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224823891600).

155212400000 is an abundant number, since it is smaller than the sum of its proper divisors (294435383200).

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

155212400000 is an frugal number, since it uses more digits than its factorization.

155212400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7972 (or 7933 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 155212400000 its reverse (4212551), we get a palindrome (155216612551).

The spelling of 155212400000 in words is "one hundred fifty-five billion, two hundred twelve million, four hundred thousand".