65660987537 has 8 divisors (see below), whose sum is σ = 65743667496. Its totient is φ = 65578344832.

The previous prime is 65660987519. The next prime is 65660987549. The reversal of 65660987537 is 73578906656.

It is a Cunningham number, because it is equal to 256244²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 65660987536 = 1^2 + 256244^2 .

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 65660987537 - 2¹⁸ = 65660725393 is a prime.

It is a super-2 number, since 2×65660987537² (a number of 22 digits) contains 22 as substring.

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 65660987537.

It is not an unprimeable number, because it can be changed into a prime (65660987137) 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, 5298893 + ... + 5311269.

It is an arithmetic number, because the mean of its divisors is an integer number (8217958437).

Almost surely, 2^65660987537 is an apocalyptic number.

It is an amenable number.

65660987537 is a deficient number, since it is larger than the sum of its proper divisors (82679959).

65660987537 is a wasteful number, since it uses less digits than its factorization.

65660987537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18627.

The product of its (nonzero) digits is 57153600, while the sum is 62.

The spelling of 65660987537 in words is "sixty-five billion, six hundred sixty million, nine hundred eighty-seven thousand, five hundred thirty-seven".