84776361661 has 4 divisors (see below), whose sum is σ = 85249972800. Its totient is φ = 84302750524.

The previous prime is 84776361653. The next prime is 84776361671. The reversal of 84776361661 is 16616367748.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84776361661 - 2³ = 84776361653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84776361671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236805301 + ... + 236805658.

It is an arithmetic number, because the mean of its divisors is an integer number (21312493200).

Almost surely, 2^84776361661 is an apocalyptic number.

It is an amenable number.

84776361661 is a deficient number, since it is larger than the sum of its proper divisors (473611139).

84776361661 is a wasteful number, since it uses less digits than its factorization.

84776361661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473611138.

The product of its digits is 6096384, while the sum is 55.

The spelling of 84776361661 in words is "eighty-four billion, seven hundred seventy-six million, three hundred sixty-one thousand, six hundred sixty-one".