4637977661 has 2 divisors, whose sum is σ = 4637977662. Its totient is φ = 4637977660.

The previous prime is 4637977651. The next prime is 4637977679. The reversal of 4637977661 is 1667797364.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4167348025 + 470629636 = 64555^2 + 21694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4637977661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4637977597 and 4637977606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4637977651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2318988830 + 2318988831.

It is an arithmetic number, because the mean of its divisors is an integer number (2318988831).

Almost surely, 2^4637977661 is an apocalyptic number.

It is an amenable number.

4637977661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4637977661 is an equidigital number, since it uses as much as digits as its factorization.

4637977661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8001504, while the sum is 56.

The square root of 4637977661 is about 68102.6993664715. The cubic root of 4637977661 is about 1667.6678289152.

The spelling of 4637977661 in words is "four billion, six hundred thirty-seven million, nine hundred seventy-seven thousand, six hundred sixty-one".