155111430400 has 108 divisors (see below), whose sum is σ = 392094404352. Its totient is φ = 60724357120.

The previous prime is 155111430373. The next prime is 155111430401. The reversal of 155111430400 is 4034111551.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (155111430401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42969 + ... + 558631.

It is an arithmetic number, because the mean of its divisors is an integer number (3630503744).

Almost surely, 2^155111430400 is an apocalyptic number.

155111430400 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 155111430400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196047202176).

155111430400 is an abundant number, since it is smaller than the sum of its proper divisors (236982973952).

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

155111430400 is an equidigital number, since it uses as much as digits as its factorization.

155111430400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515736 (or 515717 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 155111430400 its reverse (4034111551), we get a palindrome (159145541951).

The spelling of 155111430400 in words is "one hundred fifty-five billion, one hundred eleven million, four hundred thirty thousand, four hundred".