65561637 has 8 divisors (see below), whose sum is σ = 87921504. Its totient is φ = 43454768.

The previous prime is 65561611. The next prime is 65561651. The reversal of 65561637 is 73616556.

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 65561637 - 2¹⁰ = 65560613 is a prime.

It is a super-2 number, since 2×65561637² = 8596656492239538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65561595 and 65561604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62643 + ... + 63680.

It is an arithmetic number, because the mean of its divisors is an integer number (10990188).

Almost surely, 2^65561637 is an apocalyptic number.

It is an amenable number.

65561637 is a deficient number, since it is larger than the sum of its proper divisors (22359867).

65561637 is a wasteful number, since it uses less digits than its factorization.

65561637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126499.

The product of its digits is 113400, while the sum is 39.

The square root of 65561637 is about 8097.0140792764. The cubic root of 65561637 is about 403.2273016971.

The spelling of 65561637 in words is "sixty-five million, five hundred sixty-one thousand, six hundred thirty-seven".