65212155 has 32 divisors (see below), whose sum is σ = 119937600. Its totient is φ = 33578496.

The previous prime is 65212117. The next prime is 65212159. The reversal of 65212155 is 55121256.

65212155 is a `hidden beast` number, since 652 + 1 + 2 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 65212155 - 2¹⁶ = 65146619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65212159) 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 31 ways as a sum of consecutive naturals, for example, 4414 + ... + 12243.

It is an arithmetic number, because the mean of its divisors is an integer number (3748050).

Almost surely, 2^65212155 is an apocalyptic number.

65212155 is a deficient number, since it is larger than the sum of its proper divisors (54725445).

65212155 is a wasteful number, since it uses less digits than its factorization.

65212155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16700 (or 16694 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 65212155 is about 8075.4043242428. The cubic root of 65212155 is about 402.5095454444.

The spelling of 65212155 in words is "sixty-five million, two hundred twelve thousand, one hundred fifty-five".