66001520 has 40 divisors (see below), whose sum is σ = 165260256. Its totient is φ = 24369408.

The previous prime is 66001447. The next prime is 66001541. The reversal of 66001520 is 2510066.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 66001492 and 66001501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30692 + ... + 32771.

Almost surely, 2^66001520 is an apocalyptic number.

It is an amenable number.

66001520 is an abundant number, since it is smaller than the sum of its proper divisors (99258736).

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

66001520 is a wasteful number, since it uses less digits than its factorization.

66001520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63489 (or 63483 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 66001520 is about 8124.1319536305. The cubic root of 66001520 is about 404.1271044045.

Adding to 66001520 its reverse (2510066), we get a palindrome (68511586).

The spelling of 66001520 in words is "sixty-six million, one thousand, five hundred twenty".