65557210191 has 8 divisors (see below), whose sum is σ = 95355942144. Its totient is φ = 39731642520.

The previous prime is 65557210153. The next prime is 65557210193. The reversal of 65557210191 is 19101275556.

65557210191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65557210191 - 2⁶ = 65557210127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65557210193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 993291031 + ... + 993291096.

It is an arithmetic number, because the mean of its divisors is an integer number (11919492768).

Almost surely, 2^65557210191 is an apocalyptic number.

65557210191 is a deficient number, since it is larger than the sum of its proper divisors (29798731953).

65557210191 is a wasteful number, since it uses less digits than its factorization.

65557210191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986582141.

The product of its (nonzero) digits is 94500, while the sum is 42.

The spelling of 65557210191 in words is "sixty-five billion, five hundred fifty-seven million, two hundred ten thousand, one hundred ninety-one".