61838243653 has 2 divisors, whose sum is σ = 61838243654. Its totient is φ = 61838243652.

The previous prime is 61838243629. The next prime is 61838243659. The reversal of 61838243653 is 35634283816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61671265569 + 166978084 = 248337^2 + 12922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61838243653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61838243597 and 61838243606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61838243659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30919121826 + 30919121827.

It is an arithmetic number, because the mean of its divisors is an integer number (30919121827).

Almost surely, 2^61838243653 is an apocalyptic number.

It is an amenable number.

61838243653 is a deficient number, since it is larger than the sum of its proper divisors (1).

61838243653 is an equidigital number, since it uses as much as digits as its factorization.

61838243653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 49.

The spelling of 61838243653 in words is "sixty-one billion, eight hundred thirty-eight million, two hundred forty-three thousand, six hundred fifty-three".