42327454507661 has 2 divisors, whose sum is σ = 42327454507662. Its totient is φ = 42327454507660.

The previous prime is 42327454507523. The next prime is 42327454507711. The reversal of 42327454507661 is 16670545472324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30892364448100 + 11435090059561 = 5558090^2 + 3381581^2 .

It is a cyclic number.

It is not a de Polignac number, because 42327454507661 - 2¹⁰ = 42327454506637 is a prime.

It is a super-2 number, since 2×42327454507661² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42327454507597 and 42327454507606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42327454507061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21163727253830 + 21163727253831.

It is an arithmetic number, because the mean of its divisors is an integer number (21163727253831).

Almost surely, 2^{42327454507661} is an apocalyptic number.

It is an amenable number.

42327454507661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42327454507661 is an equidigital number, since it uses as much as digits as its factorization.

42327454507661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33868800, while the sum is 56.

Adding to 42327454507661 its reverse (16670545472324), we get a palindrome (58997999979985).

The spelling of 42327454507661 in words is "forty-two trillion, three hundred twenty-seven billion, four hundred fifty-four million, five hundred seven thousand, six hundred sixty-one".