97644195541 has 2 divisors, whose sum is σ = 97644195542. Its totient is φ = 97644195540.

The previous prime is 97644195533. The next prime is 97644195547. The reversal of 97644195541 is 14559144679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96264370225 + 1379825316 = 310265^2 + 37146^2 .

It is a cyclic number.

It is not a de Polignac number, because 97644195541 - 2³ = 97644195533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97644195547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48822097770 + 48822097771.

It is an arithmetic number, because the mean of its divisors is an integer number (48822097771).

Almost surely, 2^97644195541 is an apocalyptic number.

It is an amenable number.

97644195541 is a deficient number, since it is larger than the sum of its proper divisors (1).

97644195541 is an equidigital number, since it uses as much as digits as its factorization.

97644195541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 55.

The spelling of 97644195541 in words is "ninety-seven billion, six hundred forty-four million, one hundred ninety-five thousand, five hundred forty-one".