1521664254 has 96 divisors (see below), whose sum is σ = 3832448256. Its totient is φ = 431228160.

The previous prime is 1521664247. The next prime is 1521664273. The reversal of 1521664254 is 4524661251.

1521664254 is a `hidden beast` number, since 1 + 5 + 2 + 1 + 6 + 642 + 5 + 4 = 666.

It is a super-3 number, since 3×1521664254³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 560769 + ... + 563475.

It is an arithmetic number, because the mean of its divisors is an integer number (39921336).

Almost surely, 2^1521664254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1521664254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1916224128).

1521664254 is an abundant number, since it is smaller than the sum of its proper divisors (2310784002).

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

1521664254 is a wasteful number, since it uses less digits than its factorization.

1521664254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910 (or 2907 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 1521664254 is about 39008.5151473367. The cubic root of 1521664254 is about 1150.1988954032.

The spelling of 1521664254 in words is "one billion, five hundred twenty-one million, six hundred sixty-four thousand, two hundred fifty-four".