83561397737 has 2 divisors, whose sum is σ = 83561397738. Its totient is φ = 83561397736.

The previous prime is 83561397697. The next prime is 83561397749. The reversal of 83561397737 is 73779316538.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81556507561 + 2004890176 = 285581^2 + 44776^2 .

It is a cyclic number.

It is not a de Polignac number, because 83561397737 - 2¹⁰ = 83561396713 is a prime.

It is a super-2 number, since 2×83561397737² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (83561397767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41780698868 + 41780698869.

It is an arithmetic number, because the mean of its divisors is an integer number (41780698869).

Almost surely, 2^83561397737 is an apocalyptic number.

It is an amenable number.

83561397737 is a deficient number, since it is larger than the sum of its proper divisors (1).

83561397737 is an equidigital number, since it uses as much as digits as its factorization.

83561397737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20003760, while the sum is 59.

The spelling of 83561397737 in words is "eighty-three billion, five hundred sixty-one million, three hundred ninety-seven thousand, seven hundred thirty-seven".