42756544486661 has 2 divisors, whose sum is σ = 42756544486662. Its totient is φ = 42756544486660.

The previous prime is 42756544486631. The next prime is 42756544486699. The reversal of 42756544486661 is 16668444565724.

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., 29960406432100 + 12796138054561 = 5473610^2 + 3577169^2 .

It is a cyclic number.

It is not a de Polignac number, because 42756544486661 - 2²⁶ = 42756477377797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42756544486591 and 42756544486600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42756544486631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21378272243330 + 21378272243331.

It is an arithmetic number, because the mean of its divisors is an integer number (21378272243331).

Almost surely, 2^{42756544486661} is an apocalyptic number.

It is an amenable number.

42756544486661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42756544486661 is an equidigital number, since it uses as much as digits as its factorization.

42756544486661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 928972800, while the sum is 68.

The spelling of 42756544486661 in words is "forty-two trillion, seven hundred fifty-six billion, five hundred forty-four million, four hundred eighty-six thousand, six hundred sixty-one".