97442477861 has 2 divisors, whose sum is σ = 97442477862. Its totient is φ = 97442477860.

The previous prime is 97442477849. The next prime is 97442477893. The reversal of 97442477861 is 16877424479.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55250853025 + 42191624836 = 235055^2 + 205406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97442477861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97442477861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97442477161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48721238930 + 48721238931.

It is an arithmetic number, because the mean of its divisors is an integer number (48721238931).

Almost surely, 2^97442477861 is an apocalyptic number.

It is an amenable number.

97442477861 is a deficient number, since it is larger than the sum of its proper divisors (1).

97442477861 is an equidigital number, since it uses as much as digits as its factorization.

97442477861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18966528, while the sum is 59.

The spelling of 97442477861 in words is "ninety-seven billion, four hundred forty-two million, four hundred seventy-seven thousand, eight hundred sixty-one".