25221533364 has 144 divisors (see below), whose sum is σ = 66280032000. Its totient is φ = 8082277632.

The previous prime is 25221533357. The next prime is 25221533369. The reversal of 25221533364 is 46333512252.

25221533364 is a `hidden beast` number, since 2 + 52 + 215 + 33 + 364 = 666.

It is a super-2 number, since 2×25221533364² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221533369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22458507 + ... + 22459629.

It is an arithmetic number, because the mean of its divisors is an integer number (460278000).

Almost surely, 2^25221533364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25221533364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33140016000).

25221533364 is an abundant number, since it is smaller than the sum of its proper divisors (41058498636).

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

25221533364 is a wasteful number, since it uses less digits than its factorization.

25221533364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414 (or 1409 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The spelling of 25221533364 in words is "twenty-five billion, two hundred twenty-one million, five hundred thirty-three thousand, three hundred sixty-four".