21661411447662 has 16 divisors (see below), whose sum is σ = 49511797594752. Its totient is φ = 6188974699320.

The previous prime is 21661411447651. The next prime is 21661411447733. The reversal of 21661411447662 is 26674411416612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257873945764 + ... + 257873945847.

It is an arithmetic number, because the mean of its divisors is an integer number (3094487349672).

Almost surely, 2^{21661411447662} is an apocalyptic number.

21661411447662 is an abundant number, since it is smaller than the sum of its proper divisors (27850386147090).

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

21661411447662 is a wasteful number, since it uses less digits than its factorization.

21661411447662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515747891623.

The product of its digits is 2322432, while the sum is 51.

The spelling of 21661411447662 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred eleven million, four hundred forty-seven thousand, six hundred sixty-two".