65040340561 has 48 divisors (see below), whose sum is σ = 81567984960. Its totient is φ = 51547466880.

The previous prime is 65040340559. The next prime is 65040340583. The reversal of 65040340561 is 16504304056.

65040340561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65040340561 - 2¹ = 65040340559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65040340361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9717226 + ... + 9723916.

It is an arithmetic number, because the mean of its divisors is an integer number (1699333020).

Almost surely, 2^65040340561 is an apocalyptic number.

It is an amenable number.

65040340561 is a deficient number, since it is larger than the sum of its proper divisors (16527644399).

65040340561 is a wasteful number, since it uses less digits than its factorization.

65040340561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6974 (or 6967 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 65040340561 in words is "sixty-five billion, forty million, three hundred forty thousand, five hundred sixty-one".