97444649537 has 4 divisors (see below), whose sum is σ = 97447071060. Its totient is φ = 97442228016.

The previous prime is 97444649509. The next prime is 97444649551. The reversal of 97444649537 is 73594644479.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73594644479 = 19 ⋅3873402341.

It can be written as a sum of positive squares in 2 ways, for example, as 55792329616 + 41652319921 = 236204^2 + 204089^2 .

It is a cyclic number.

It is not a de Polignac number, because 97444649537 - 2⁶ = 97444649473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97444649537.

It is not an unprimeable number, because it can be changed into a prime (97444649507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1149362 + ... + 1231227.

It is an arithmetic number, because the mean of its divisors is an integer number (24361767765).

Almost surely, 2^97444649537 is an apocalyptic number.

It is an amenable number.

97444649537 is a deficient number, since it is larger than the sum of its proper divisors (2421523).

97444649537 is a wasteful number, since it uses less digits than its factorization.

97444649537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421522.

The product of its digits is 91445760, while the sum is 62.

The spelling of 97444649537 in words is "ninety-seven billion, four hundred forty-four million, six hundred forty-nine thousand, five hundred thirty-seven".