65563661015 has 16 divisors (see below), whose sum is σ = 80004316896. Its totient is φ = 51566467200.

The previous prime is 65563660949. The next prime is 65563661047. The reversal of 65563661015 is 51016636556.

It is a happy number.

It is not a de Polignac number, because 65563661015 - 2¹⁰ = 65563659991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 602804 + ... + 703206.

It is an arithmetic number, because the mean of its divisors is an integer number (5000269806).

Almost surely, 2^65563661015 is an apocalyptic number.

65563661015 is a deficient number, since it is larger than the sum of its proper divisors (14440655881).

65563661015 is a wasteful number, since it uses less digits than its factorization.

65563661015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102610.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 65563661015 in words is "sixty-five billion, five hundred sixty-three million, six hundred sixty-one thousand, fifteen".