97905870661 has 2 divisors, whose sum is σ = 97905870662. Its totient is φ = 97905870660.

The previous prime is 97905870641. The next prime is 97905870677. The reversal of 97905870661 is 16607850979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53624664900 + 44281205761 = 231570^2 + 210431^2 .

It is a cyclic number.

It is not a de Polignac number, because 97905870661 - 2²¹ = 97903773509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 97905870596 and 97905870605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97905870611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48952935330 + 48952935331.

It is an arithmetic number, because the mean of its divisors is an integer number (48952935331).

Almost surely, 2^97905870661 is an apocalyptic number.

It is an amenable number.

97905870661 is a deficient number, since it is larger than the sum of its proper divisors (1).

97905870661 is an equidigital number, since it uses as much as digits as its factorization.

97905870661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 58.

The spelling of 97905870661 in words is "ninety-seven billion, nine hundred five million, eight hundred seventy thousand, six hundred sixty-one".