65511151 has 4 divisors (see below), whose sum is σ = 65555152. Its totient is φ = 65467152.

The previous prime is 65511143. The next prime is 65511157. The reversal of 65511151 is 15111556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65511151 - 2³ = 65511143 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 (65511157) 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, 19686 + ... + 22771.

It is an arithmetic number, because the mean of its divisors is an integer number (16388788).

Almost surely, 2^65511151 is an apocalyptic number.

65511151 is a deficient number, since it is larger than the sum of its proper divisors (44001).

65511151 is a wasteful number, since it uses less digits than its factorization.

65511151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44000.

The product of its digits is 750, while the sum is 25.

The square root of 65511151 is about 8093.8959098817. The cubic root of 65511151 is about 403.1237728545.

The spelling of 65511151 in words is "sixty-five million, five hundred eleven thousand, one hundred fifty-one".