1281620224666 has 8 divisors (see below), whose sum is σ = 1924754922720. Its totient is φ = 640035250428.

The previous prime is 1281620224631. The next prime is 1281620224667. The reversal of 1281620224666 is 6664220261821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1281620224667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387428886 + ... + 387432193.

It is an arithmetic number, because the mean of its divisors is an integer number (240594365340).

Almost surely, 2^{1281620224666} is an apocalyptic number.

1281620224666 is a deficient number, since it is larger than the sum of its proper divisors (643134698054).

1281620224666 is an equidigital number, since it uses as much as digits as its factorization.

1281620224666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774861908.

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 1281620224666 in words is "one trillion, two hundred eighty-one billion, six hundred twenty million, two hundred twenty-four thousand, six hundred sixty-six".