66613530 has 32 divisors (see below), whose sum is σ = 160902144. Its totient is φ = 17649216.

The previous prime is 66613529. The next prime is 66613577. The reversal of 66613530 is 3531666.

It is a super-3 number, since 3×66613530³ (a number of 24 digits) contains 333 as substring.

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

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, 2362 + ... + 11781.

It is an arithmetic number, because the mean of its divisors is an integer number (5028192).

Almost surely, 2^66613530 is an apocalyptic number.

66613530 is an abundant number, since it is smaller than the sum of its proper divisors (94288614).

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

66613530 is a wasteful number, since it uses less digits than its factorization.

66613530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14310.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 66613530 is about 8161.7112176308. The cubic root of 66613530 is about 405.3723750903.

It can be divided in two parts, 666 and 13530, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 66613530 in words is "sixty-six million, six hundred thirteen thousand, five hundred thirty".