65445551 has 4 divisors (see below), whose sum is σ = 65461992. Its totient is φ = 65429112.

The previous prime is 65445539. The next prime is 65445617. The reversal of 65445551 is 15554456.

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 65445551 - 2⁶ = 65445487 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 (65445451) 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, 1925 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (16365498).

Almost surely, 2^65445551 is an apocalyptic number.

65445551 is a deficient number, since it is larger than the sum of its proper divisors (16441).

65445551 is an equidigital number, since it uses as much as digits as its factorization.

65445551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16440.

The product of its digits is 60000, while the sum is 35.

The square root of 65445551 is about 8089.8424582930. The cubic root of 65445551 is about 402.9891710809.

The spelling of 65445551 in words is "sixty-five million, four hundred forty-five thousand, five hundred fifty-one".