65553791 has 4 divisors (see below), whose sum is σ = 65571552. Its totient is φ = 65536032.

The previous prime is 65553757. The next prime is 65553821. The reversal of 65553791 is 19735556.

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 65553791 - 2⁶ = 65553727 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 (65553701) 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, 1031 + ... + 11496.

It is an arithmetic number, because the mean of its divisors is an integer number (16392888).

Almost surely, 2^65553791 is an apocalyptic number.

65553791 is a deficient number, since it is larger than the sum of its proper divisors (17761).

65553791 is a wasteful number, since it uses less digits than its factorization.

65553791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17760.

The product of its digits is 141750, while the sum is 41.

The square root of 65553791 is about 8096.5295651903. The cubic root of 65553791 is about 403.2112158286.

The spelling of 65553791 in words is "sixty-five million, five hundred fifty-three thousand, seven hundred ninety-one".