66715120 has 40 divisors (see below), whose sum is σ = 155525760. Its totient is φ = 26615040.

The previous prime is 66715097. The next prime is 66715127. The reversal of 66715120 is 2151766.

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

It is a super-2 number, since 2×66715120² = 8901814473228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66715127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37450 + ... + 39190.

It is an arithmetic number, because the mean of its divisors is an integer number (3888144).

Almost surely, 2^66715120 is an apocalyptic number.

It is an amenable number.

66715120 is an abundant number, since it is smaller than the sum of its proper divisors (88810640).

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

66715120 is a wasteful number, since it uses less digits than its factorization.

66715120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233 (or 2227 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 66715120 is about 8167.9324189173. The cubic root of 66715120 is about 405.5783435692.

Adding to 66715120 its reverse (2151766), we get a palindrome (68866886).

The spelling of 66715120 in words is "sixty-six million, seven hundred fifteen thousand, one hundred twenty".