65990115 has 48 divisors (see below), whose sum is σ = 119822976. Its totient is φ = 33561600.

The previous prime is 65990087. The next prime is 65990117. The reversal of 65990115 is 51109956.

It is not a de Polignac number, because 65990115 - 2¹⁴ = 65973731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65990115.

It is not an unprimeable number, because it can be changed into a prime (65990117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86335 + ... + 87095.

It is an arithmetic number, because the mean of its divisors is an integer number (2496312).

Almost surely, 2^65990115 is an apocalyptic number.

65990115 is a deficient number, since it is larger than the sum of its proper divisors (53832861).

65990115 is a wasteful number, since it uses less digits than its factorization.

65990115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 65990115 is about 8123.4300021604. The cubic root of 65990115 is about 404.1038254702.

The spelling of 65990115 in words is "sixty-five million, nine hundred ninety thousand, one hundred fifteen".