21666323462 has 8 divisors (see below), whose sum is σ = 37142268816. Its totient is φ = 9285567192.

The previous prime is 21666323431. The next prime is 21666323473. The reversal of 21666323462 is 26432366612.

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

It is a congruent 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, 773797253 + ... + 773797280.

It is an arithmetic number, because the mean of its divisors is an integer number (4642783602).

Almost surely, 2^21666323462 is an apocalyptic number.

21666323462 is a deficient number, since it is larger than the sum of its proper divisors (15475945354).

21666323462 is a wasteful number, since it uses less digits than its factorization.

21666323462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547594542.

The product of its digits is 373248, while the sum is 41.

The spelling of 21666323462 in words is "twenty-one billion, six hundred sixty-six million, three hundred twenty-three thousand, four hundred sixty-two".