65990155 has 16 divisors (see below), whose sum is σ = 98728704. Its totient is φ = 41136480.

The previous prime is 65990153. The next prime is 65990161. The reversal of 65990155 is 55109956.

It is not a de Polignac number, because 65990155 - 2¹ = 65990153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65990153) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 85317 + ... + 86086.

It is an arithmetic number, because the mean of its divisors is an integer number (6170544).

Almost surely, 2^65990155 is an apocalyptic number.

65990155 is a deficient number, since it is larger than the sum of its proper divisors (32738549).

65990155 is a wasteful number, since it uses less digits than its factorization.

65990155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171426.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 65990155 is about 8123.4324641742. The cubic root of 65990155 is about 404.1039071196.

It can be divided in two parts, 659901 and 55, that added together give a palindrome (659956).

The spelling of 65990155 in words is "sixty-five million, nine hundred ninety thousand, one hundred fifty-five".