66881010 has 128 divisors (see below), whose sum is σ = 195416064. Its totient is φ = 14319360.

The previous prime is 66880999. The next prime is 66881027. The reversal of 66881010 is 1018866.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 294517 + ... + 294743.

It is an arithmetic number, because the mean of its divisors is an integer number (1526688).

Almost surely, 2^66881010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66881010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97708032).

66881010 is an abundant number, since it is smaller than the sum of its proper divisors (128535054).

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

66881010 is a wasteful number, since it uses less digits than its factorization.

66881010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 66881010 is about 8178.0810707647. The cubic root of 66881010 is about 405.9142279599.

Adding to 66881010 its reverse (1018866), we get a palindrome (67899876).

The spelling of 66881010 in words is "sixty-six million, eight hundred eighty-one thousand, ten".