9969157572 has 144 divisors (see below), whose sum is σ = 26072766720. Its totient is φ = 2961953280.

The previous prime is 9969157571. The next prime is 9969157573. The reversal of 9969157572 is 2757519699.

It is an interprime number because it is at equal distance from previous prime (9969157571) and next prime (9969157573).

It is not an unprimeable number, because it can be changed into a prime (9969157571) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26726778 + ... + 26727150.

It is an arithmetic number, because the mean of its divisors is an integer number (181060880).

Almost surely, 2^9969157572 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 9969157572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13036383360).

9969157572 is an abundant number, since it is smaller than the sum of its proper divisors (16103609148).

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

9969157572 is a wasteful number, since it uses less digits than its factorization.

9969157572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 701 counting only the distinct ones).

The product of its digits is 10716300, while the sum is 60.

The square root of 9969157572 is about 99845.6687693562. The cubic root of 9969157572 is about 2152.2174757645.

The spelling of 9969157572 in words is "nine billion, nine hundred sixty-nine million, one hundred fifty-seven thousand, five hundred seventy-two".