1581669960218 has 8 divisors (see below), whose sum is σ = 2372515602240. Its totient is φ = 790831426140.

The previous prime is 1581669960209. The next prime is 1581669960229. The reversal of 1581669960218 is 8120699661851.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180658 + ... + 2134781.

It is an arithmetic number, because the mean of its divisors is an integer number (296564450280).

Almost surely, 2^{1581669960218} is an apocalyptic number.

1581669960218 is a deficient number, since it is larger than the sum of its proper divisors (790845642022).

1581669960218 is a wasteful number, since it uses less digits than its factorization.

1581669960218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553972.

The product of its (nonzero) digits is 11197440, while the sum is 62.

The spelling of 1581669960218 in words is "one trillion, five hundred eighty-one billion, six hundred sixty-nine million, nine hundred sixty thousand, two hundred eighteen".