11721501825 has 96 divisors (see below), whose sum is σ = 21670612992. Its totient is φ = 5542656000.

The previous prime is 11721501823. The next prime is 11721501829. The reversal of 11721501825 is 52810512711.

It is not a de Polignac number, because 11721501825 - 2¹ = 11721501823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11721501823) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5680744 + ... + 5682806.

It is an arithmetic number, because the mean of its divisors is an integer number (225735552).

Almost surely, 2^11721501825 is an apocalyptic number.

11721501825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11721501825 is a deficient number, since it is larger than the sum of its proper divisors (9949111167).

11721501825 is a wasteful number, since it uses less digits than its factorization.

11721501825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255 (or 2250 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 33.

The spelling of 11721501825 in words is "eleven billion, seven hundred twenty-one million, five hundred one thousand, eight hundred twenty-five".