66701520 has 60 divisors (see below), whose sum is σ = 224008356. Its totient is φ = 17786880.

The previous prime is 66701483. The next prime is 66701521. The reversal of 66701520 is 2510766.

It can be written as a sum of positive squares in 2 ways, for example, as 50637456 + 16064064 = 7116^2 + 4008^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66701521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45601 + ... + 47040.

Almost surely, 2^66701520 is an apocalyptic number.

66701520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66701520 is an abundant number, since it is smaller than the sum of its proper divisors (157306836).

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

66701520 is a wasteful number, since it uses less digits than its factorization.

66701520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92660 (or 92651 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 66701520 is about 8167.0998524568. The cubic root of 66701520 is about 405.5507823990.

The spelling of 66701520 in words is "sixty-six million, seven hundred one thousand, five hundred twenty".