65121885 has 12 divisors (see below), whose sum is σ = 112878012. Its totient is φ = 34731648.

The previous prime is 65121877. The next prime is 65121893. The reversal of 65121885 is 58812156.

It is an interprime number because it is at equal distance from previous prime (65121877) and next prime (65121893).

It can be written as a sum of positive squares in 2 ways, for example, as 37527876 + 27594009 = 6126^2 + 5253^2 .

It is not a de Polignac number, because 65121885 - 2³ = 65121877 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 723532 + ... + 723621.

It is an arithmetic number, because the mean of its divisors is an integer number (9406501).

Almost surely, 2^65121885 is an apocalyptic number.

It is an amenable number.

65121885 is a deficient number, since it is larger than the sum of its proper divisors (47756127).

65121885 is a wasteful number, since it uses less digits than its factorization.

65121885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447164 (or 1447161 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 65121885 is about 8069.8131948639. The cubic root of 65121885 is about 402.3237349160.

The spelling of 65121885 in words is "sixty-five million, one hundred twenty-one thousand, eight hundred eighty-five".