65055551 has 4 divisors (see below), whose sum is σ = 70969704. Its totient is φ = 59141400.

The previous prime is 65055547. The next prime is 65055559. The reversal of 65055551 is 15555056.

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 65055551 - 2² = 65055547 is a prime.

It is a super-3 number, since 3×65055551³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65055559) 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, 2957060 + ... + 2957081.

It is an arithmetic number, because the mean of its divisors is an integer number (17742426).

Almost surely, 2^65055551 is an apocalyptic number.

65055551 is a deficient number, since it is larger than the sum of its proper divisors (5914153).

65055551 is a wasteful number, since it uses less digits than its factorization.

65055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5914152.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 65055551 is about 8065.7021393057. The cubic root of 65055551 is about 402.1870844425.

The spelling of 65055551 in words is "sixty-five million, fifty-five thousand, five hundred fifty-one".