4978752757661 has 2 divisors, whose sum is σ = 4978752757662. Its totient is φ = 4978752757660.

The previous prime is 4978752757597. The next prime is 4978752757673. The reversal of 4978752757661 is 1667572578794.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4969305889636 + 9446868025 = 2229194^2 + 97195^2 .

It is a cyclic number.

It is not a de Polignac number, because 4978752757661 - 2⁶ = 4978752757597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4978752357661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489376378830 + 2489376378831.

It is an arithmetic number, because the mean of its divisors is an integer number (2489376378831).

Almost surely, 2^{4978752757661} is an apocalyptic number.

It is an amenable number.

4978752757661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4978752757661 is an equidigital number, since it uses as much as digits as its factorization.

4978752757661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244678400, while the sum is 74.

The spelling of 4978752757661 in words is "four trillion, nine hundred seventy-eight billion, seven hundred fifty-two million, seven hundred fifty-seven thousand, six hundred sixty-one".