65139553 has 4 divisors (see below), whose sum is σ = 65227968. Its totient is φ = 65051140.

The previous prime is 65139551. The next prime is 65139559. The reversal of 65139553 is 35593156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65139553 - 2¹ = 65139551 is a prime.

It is a super-2 number, since 2×65139553² = 8486322730079618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65139551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43093 + ... + 44578.

It is an arithmetic number, because the mean of its divisors is an integer number (16306992).

Almost surely, 2^65139553 is an apocalyptic number.

It is an amenable number.

65139553 is a deficient number, since it is larger than the sum of its proper divisors (88415).

65139553 is an equidigital number, since it uses as much as digits as its factorization.

65139553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88414.

The product of its digits is 60750, while the sum is 37.

The square root of 65139553 is about 8070.9078175878. The cubic root of 65139553 is about 402.3601159933.

It can be divided in two parts, 651 and 39553, that added together give a palindrome (40204).

The spelling of 65139553 in words is "sixty-five million, one hundred thirty-nine thousand, five hundred fifty-three".