61320257573 has 8 divisors (see below), whose sum is σ = 61721881560. Its totient is φ = 60918773760.

The previous prime is 61320257569. The next prime is 61320257587. The reversal of 61320257573 is 37575202316.

It can be written as a sum of positive squares in 4 ways, for example, as 5026526404 + 56293731169 = 70898^2 + 237263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61320257573 - 2² = 61320257569 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 61320257573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61320277573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929093 + ... + 992901.

It is an arithmetic number, because the mean of its divisors is an integer number (7715235195).

Almost surely, 2^61320257573 is an apocalyptic number.

It is an amenable number.

61320257573 is a deficient number, since it is larger than the sum of its proper divisors (401623987).

61320257573 is a wasteful number, since it uses less digits than its factorization.

61320257573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70087.

The product of its (nonzero) digits is 264600, while the sum is 41.

Adding to 61320257573 its reverse (37575202316), we get a palindrome (98895459889).

The spelling of 61320257573 in words is "sixty-one billion, three hundred twenty million, two hundred fifty-seven thousand, five hundred seventy-three".