65642155 has 4 divisors (see below), whose sum is σ = 78770592. Its totient is φ = 52513720.

The previous prime is 65642153. The next prime is 65642177. The reversal of 65642155 is 55124656.

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

It is not a de Polignac number, because 65642155 - 2¹ = 65642153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65642155.

It is not an unprimeable number, because it can be changed into a prime (65642153) 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 3 ways as a sum of consecutive naturals, for example, 6564211 + ... + 6564220.

It is an arithmetic number, because the mean of its divisors is an integer number (19692648).

Almost surely, 2^65642155 is an apocalyptic number.

65642155 is a deficient number, since it is larger than the sum of its proper divisors (13128437).

65642155 is a wasteful number, since it uses less digits than its factorization.

65642155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13128436.

The product of its digits is 36000, while the sum is 34.

The square root of 65642155 is about 8101.9846334093. The cubic root of 65642155 is about 403.3923055785.

The spelling of 65642155 in words is "sixty-five million, six hundred forty-two thousand, one hundred fifty-five".