65243551 has 4 divisors (see below), whose sum is σ = 65259712. Its totient is φ = 65227392.

The previous prime is 65243539. The next prime is 65243593. The reversal of 65243551 is 15534256.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 65243551 - 2⁹ = 65243039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65243351) 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, 3730 + ... + 12016.

It is an arithmetic number, because the mean of its divisors is an integer number (16314928).

Almost surely, 2^65243551 is an apocalyptic number.

65243551 is a deficient number, since it is larger than the sum of its proper divisors (16161).

65243551 is an equidigital number, since it uses as much as digits as its factorization.

65243551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16160.

The product of its digits is 18000, while the sum is 31.

The square root of 65243551 is about 8077.3480177593. The cubic root of 65243551 is about 402.5741303479.

The spelling of 65243551 in words is "sixty-five million, two hundred forty-three thousand, five hundred fifty-one".