4491870096661 has 2 divisors, whose sum is σ = 4491870096662. Its totient is φ = 4491870096660.

The previous prime is 4491870096587. The next prime is 4491870096673. The reversal of 4491870096661 is 1666900781944.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4184094796036 + 307775300625 = 2045506^2 + 554775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4491870096661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4491870096661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4491870096691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2245935048330 + 2245935048331.

It is an arithmetic number, because the mean of its divisors is an integer number (2245935048331).

Almost surely, 2^{4491870096661} is an apocalyptic number.

It is an amenable number.

4491870096661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4491870096661 is an equidigital number, since it uses as much as digits as its factorization.

4491870096661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 4491870096661 in words is "four trillion, four hundred ninety-one billion, eight hundred seventy million, ninety-six thousand, six hundred sixty-one".