501601601500 has 96 divisors (see below), whose sum is σ = 1120439174400. Its totient is φ = 196085120000.

The previous prime is 501601601477. The next prime is 501601601563. The reversal of 501601601500 is 5106106105.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16458276 + ... + 16488724.

It is an arithmetic number, because the mean of its divisors is an integer number (11671241400).

Almost surely, 2^501601601500 is an apocalyptic number.

501601601500 is a gapful number since it is divisible by the number (50) 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 501601601500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (560219587200).

501601601500 is an abundant number, since it is smaller than the sum of its proper divisors (618837572900).

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

501601601500 is a wasteful number, since it uses less digits than its factorization.

501601601500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31216 (or 31204 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 501601601500 its reverse (5106106105), we get a palindrome (506707707605).

The spelling of 501601601500 in words is "five hundred one billion, six hundred one million, six hundred one thousand, five hundred".