65375815 has 4 divisors (see below), whose sum is σ = 78450984. Its totient is φ = 52300648.

The previous prime is 65375813. The next prime is 65375819. The reversal of 65375815 is 51857356.

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 65375815 - 2¹ = 65375813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65375813) 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, 6537577 + ... + 6537586.

It is an arithmetic number, because the mean of its divisors is an integer number (19612746).

Almost surely, 2^65375815 is an apocalyptic number.

65375815 is a deficient number, since it is larger than the sum of its proper divisors (13075169).

65375815 is a wasteful number, since it uses less digits than its factorization.

65375815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13075168.

The product of its digits is 126000, while the sum is 40.

The square root of 65375815 is about 8085.5312132228. The cubic root of 65375815 is about 402.8459841616.

The spelling of 65375815 in words is "sixty-five million, three hundred seventy-five thousand, eight hundred fifteen".