8551211520 has 160 divisors (see below), whose sum is σ = 27465242112. Its totient is φ = 2269642752.

The previous prime is 8551211507. The next prime is 8551211533. The reversal of 8551211520 is 251121558.

It is an interprime number because it is at equal distance from previous prime (8551211507) and next prime (8551211533).

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1710144 + ... + 1715136.

Almost surely, 2^8551211520 is an apocalyptic number.

8551211520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8551211520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13732621056).

8551211520 is an abundant number, since it is smaller than the sum of its proper divisors (18914030592).

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

8551211520 is a wasteful number, since it uses less digits than its factorization.

8551211520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242 (or 5226 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 30.

The square root of 8551211520 is about 92472.7609623504. The cubic root of 8551211520 is about 2044.9179308014.

The spelling of 8551211520 in words is "eight billion, five hundred fifty-one million, two hundred eleven thousand, five hundred twenty".