66660762 has 64 divisors (see below), whose sum is σ = 160395264. Its totient is φ = 18057600.

The previous prime is 66660761. The next prime is 66660773. The reversal of 66660762 is 26706666.

It is a self number, because there is not a number n which added to its sum of digits gives 66660762.

It is not an unprimeable number, because it can be changed into a prime (66660761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145638 + ... + 146094.

It is an arithmetic number, because the mean of its divisors is an integer number (2506176).

Almost surely, 2^66660762 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66660762, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80197632).

66660762 is an abundant number, since it is smaller than the sum of its proper divisors (93734502).

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

66660762 is a wasteful number, since it uses less digits than its factorization.

66660762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 66660762 is about 8164.6042157596. The cubic root of 66660762 is about 405.4681615597.

The spelling of 66660762 in words is "sixty-six million, six hundred sixty thousand, seven hundred sixty-two".