5157721520 has 160 divisors (see below), whose sum is σ = 13925108736. Its totient is φ = 1740211200.

The previous prime is 5157721507. The next prime is 5157721537. The reversal of 5157721520 is 251277515.

It is a super-2 number, since 2×5157721520² = 53204182555742220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 12250910 + ... + 12251330.

Almost surely, 2^5157721520 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 5157721520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6962554368).

5157721520 is an abundant number, since it is smaller than the sum of its proper divisors (8767387216).

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

5157721520 is a wasteful number, since it uses less digits than its factorization.

5157721520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 35.

The square root of 5157721520 is about 71817.2787008809. The cubic root of 5157721520 is about 1727.7701365339.

The spelling of 5157721520 in words is "five billion, one hundred fifty-seven million, seven hundred twenty-one thousand, five hundred twenty".