5156521720 has 64 divisors (see below), whose sum is σ = 13957516800. Its totient is φ = 1674898560.

The previous prime is 5156521673. The next prime is 5156521729. The reversal of 5156521720 is 271256515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5156521729) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 479316 + ... + 489955.

It is an arithmetic number, because the mean of its divisors is an integer number (218086200).

Almost surely, 2^5156521720 is an apocalyptic number.

It is an amenable number.

5156521720 is an abundant number, since it is smaller than the sum of its proper divisors (8800995080).

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

5156521720 is a wasteful number, since it uses less digits than its factorization.

5156521720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969308 (or 969304 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 5156521720 is about 71808.9250720271. The cubic root of 5156521720 is about 1727.6361536396.

The spelling of 5156521720 in words is "five billion, one hundred fifty-six million, five hundred twenty-one thousand, seven hundred twenty".