661776446347 has 8 divisors (see below), whose sum is σ = 664697601360. Its totient is φ = 658855983360.

The previous prime is 661776446291. The next prime is 661776446371. The reversal of 661776446347 is 743644677166.

661776446347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 661776446347 - 2¹¹ = 661776444299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661776446147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1792947 + ... + 2130307.

It is an arithmetic number, because the mean of its divisors is an integer number (83087200170).

Almost surely, 2^661776446347 is an apocalyptic number.

661776446347 is a deficient number, since it is larger than the sum of its proper divisors (2921155013).

661776446347 is a wasteful number, since it uses less digits than its factorization.

661776446347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346013.

The product of its digits is 85349376, while the sum is 61.

The spelling of 661776446347 in words is "six hundred sixty-one billion, seven hundred seventy-six million, four hundred forty-six thousand, three hundred forty-seven".