66601602 has 40 divisors (see below), whose sum is σ = 152072316. Its totient is φ = 21778848.

The previous prime is 66601567. The next prime is 66601643. The reversal of 66601602 is 20610666.

It can be written as a sum of positive squares in 2 ways, for example, as 61168041 + 5433561 = 7821^2 + 2331^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4708 + ... + 12464.

Almost surely, 2^66601602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66601602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76036158).

66601602 is an abundant number, since it is smaller than the sum of its proper divisors (85470714).

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

66601602 is a wasteful number, since it uses less digits than its factorization.

66601602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7824 (or 7815 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 66601602 is about 8160.9804558031. The cubic root of 66601602 is about 405.3481779524.

The spelling of 66601602 in words is "sixty-six million, six hundred one thousand, six hundred two".