65652121 has 8 divisors (see below), whose sum is σ = 66508488. Its totient is φ = 64800000.

The previous prime is 65652089. The next prime is 65652127. The reversal of 65652121 is 12125656.

It can be written as a sum of positive squares in 4 ways, for example, as 55666521 + 9985600 = 7461^2 + 3160^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(65652121) divides (65652121-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 65652121 - 2⁵ = 65652089 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 65652121.

It is not an unprimeable number, because it can be changed into a prime (65652127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39691 + ... + 41311.

It is an arithmetic number, because the mean of its divisors is an integer number (8313561).

Almost surely, 2^65652121 is an apocalyptic number.

It is an amenable number.

65652121 is a deficient number, since it is larger than the sum of its proper divisors (856367).

65652121 is a wasteful number, since it uses less digits than its factorization.

65652121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123.

The product of its digits is 3600, while the sum is 28.

The square root of 65652121 is about 8102.5996445585. The cubic root of 65652121 is about 403.4127193115.

Adding to 65652121 its reverse (12125656), we get a palindrome (77777777).

The spelling of 65652121 in words is "sixty-five million, six hundred fifty-two thousand, one hundred twenty-one".