66662610 has 128 divisors (see below), whose sum is σ = 197074944. Its totient is φ = 14085120.

The previous prime is 66662551. The next prime is 66662611. The reversal of 66662610 is 1626666.

66662610 = 336² + 337² + ... + 619².

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66662611) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 253339 + ... + 253601.

It is an arithmetic number, because the mean of its divisors is an integer number (1539648).

Almost surely, 2^66662610 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66662610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98537472).

66662610 is an abundant number, since it is smaller than the sum of its proper divisors (130412334).

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

66662610 is a wasteful number, since it uses less digits than its factorization.

66662610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66662610 is about 8164.7173864133. The cubic root of 66662610 is about 405.4719083827.

The spelling of 66662610 in words is "sixty-six million, six hundred sixty-two thousand, six hundred ten".