66201520 has 120 divisors (see below), whose sum is σ = 193550112. Its totient is φ = 20613120.

The previous prime is 66201479. The next prime is 66201557. The reversal of 66201520 is 2510266.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 66201491 and 66201500.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67272 + ... + 68248.

Almost surely, 2^66201520 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 66201520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96775056).

66201520 is an abundant number, since it is smaller than the sum of its proper divisors (127348592).

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

66201520 is a wasteful number, since it uses less digits than its factorization.

66201520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019 (or 1002 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66201520 is about 8136.4316502998. The cubic root of 66201520 is about 404.5348925791.

Adding to 66201520 its reverse (2510266), we get a palindrome (68711786).

The spelling of 66201520 in words is "sixty-six million, two hundred one thousand, five hundred twenty".