65035261561 has 4 divisors (see below), whose sum is σ = 65858492800. Its totient is φ = 64212030324.

The previous prime is 65035261513. The next prime is 65035261579. The reversal of 65035261561 is 16516253056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65035261561 - 2⁷ = 65035261433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65035231561) 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, 411615501 + ... + 411615658.

It is an arithmetic number, because the mean of its divisors is an integer number (16464623200).

Almost surely, 2^65035261561 is an apocalyptic number.

It is an amenable number.

65035261561 is a deficient number, since it is larger than the sum of its proper divisors (823231239).

65035261561 is an equidigital number, since it uses as much as digits as its factorization.

65035261561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823231238.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 65035261561 in words is "sixty-five billion, thirty-five million, two hundred sixty-one thousand, five hundred sixty-one".