65651855 has 4 divisors (see below), whose sum is σ = 78782232. Its totient is φ = 52521480.

The previous prime is 65651851. The next prime is 65651879. The reversal of 65651855 is 55815656.

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

It is not a de Polignac number, because 65651855 - 2² = 65651851 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 (65651851) 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, 6565181 + ... + 6565190.

It is an arithmetic number, because the mean of its divisors is an integer number (19695558).

Almost surely, 2^65651855 is an apocalyptic number.

65651855 is a deficient number, since it is larger than the sum of its proper divisors (13130377).

65651855 is a wasteful number, since it uses less digits than its factorization.

65651855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13130376.

The product of its digits is 180000, while the sum is 41.

The square root of 65651855 is about 8102.5832300569. The cubic root of 65651855 is about 403.4121744805.

The spelling of 65651855 in words is "sixty-five million, six hundred fifty-one thousand, eight hundred fifty-five".