65557210123 has 2 divisors, whose sum is σ = 65557210124. Its totient is φ = 65557210122.

The previous prime is 65557210097. The next prime is 65557210127. The reversal of 65557210123 is 32101275556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65557210123 - 2⁵ = 65557210091 is a prime.

It is a super-2 number, since 2×65557210123² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65557210127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32778605061 + 32778605062.

It is an arithmetic number, because the mean of its divisors is an integer number (32778605062).

Almost surely, 2^65557210123 is an apocalyptic number.

65557210123 is a deficient number, since it is larger than the sum of its proper divisors (1).

65557210123 is an equidigital number, since it uses as much as digits as its factorization.

65557210123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 37.

Adding to 65557210123 its reverse (32101275556), we get a palindrome (97658485679).

The spelling of 65557210123 in words is "sixty-five billion, five hundred fifty-seven million, two hundred ten thousand, one hundred twenty-three".