846661950047721 has 16 divisors (see below), whose sum is σ = 1165306557800448. Its totient is φ = 546229583350800.

The previous prime is 846661950047717. The next prime is 846661950047737. The reversal of 846661950047721 is 127740059166648.

It is not a de Polignac number, because 846661950047721 - 2² = 846661950047717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (846661950047761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19759425 + ... + 45648206.

It is an arithmetic number, because the mean of its divisors is an integer number (72831659862528).

Almost surely, 2^{846661950047721} is an apocalyptic number.

It is an amenable number.

846661950047721 is a deficient number, since it is larger than the sum of its proper divisors (318644607752727).

846661950047721 is a wasteful number, since it uses less digits than its factorization.

846661950047721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65546852.

The product of its (nonzero) digits is 121927680, while the sum is 66.

The spelling of 846661950047721 in words is "eight hundred forty-six trillion, six hundred sixty-one billion, nine hundred fifty million, forty-seven thousand, seven hundred twenty-one".