201541530400 has 144 divisors (see below), whose sum is σ = 563294571840. Its totient is φ = 68977843200.

The previous prime is 201541530383. The next prime is 201541530409. The reversal of 201541530400 is 4035145102.

It is a happy number.

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 (201541530409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3166086 + ... + 3229114.

It is an arithmetic number, because the mean of its divisors is an integer number (3911767860).

Almost surely, 2^201541530400 is an apocalyptic number.

201541530400 is a gapful number since it is divisible by the number (20) 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 201541530400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281647285920).

201541530400 is an abundant number, since it is smaller than the sum of its proper divisors (361753041440).

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

201541530400 is a wasteful number, since it uses less digits than its factorization.

201541530400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63627 (or 63614 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 201541530400 its reverse (4035145102), we get a palindrome (205576675502).

The spelling of 201541530400 in words is "two hundred one billion, five hundred forty-one million, five hundred thirty thousand, four hundred".