66644155410 has 32 divisors (see below), whose sum is σ = 182795398272. Its totient is φ = 15232949760.

The previous prime is 66644155399. The next prime is 66644155481. The reversal of 66644155410 is 1455144666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 158676351 + ... + 158676770.

It is an arithmetic number, because the mean of its divisors is an integer number (5712356196).

Almost surely, 2^66644155410 is an apocalyptic number.

66644155410 is an abundant number, since it is smaller than the sum of its proper divisors (116151242862).

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

66644155410 is a wasteful number, since it uses less digits than its factorization.

66644155410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317353138.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 66644155410 in words is "sixty-six billion, six hundred forty-four million, one hundred fifty-five thousand, four hundred ten".