65641405015 has 4 divisors (see below), whose sum is σ = 78769686024. Its totient is φ = 52513124008.

The previous prime is 65641404977. The next prime is 65641405031. The reversal of 65641405015 is 51050414656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65641405015 - 2¹⁹ = 65640880727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6564140497 + ... + 6564140506.

It is an arithmetic number, because the mean of its divisors is an integer number (19692421506).

Almost surely, 2^65641405015 is an apocalyptic number.

65641405015 is a deficient number, since it is larger than the sum of its proper divisors (13128281009).

65641405015 is a wasteful number, since it uses less digits than its factorization.

65641405015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13128281008.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 65641405015 in words is "sixty-five billion, six hundred forty-one million, four hundred five thousand, fifteen".