228664860491 has 2 divisors, whose sum is σ = 228664860492. Its totient is φ = 228664860490.

The previous prime is 228664860461. The next prime is 228664860517. The reversal of 228664860491 is 194068466822.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228664860491 is a prime.

It is a super-2 number, since 2×228664860491² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (228664860401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114332430245 + 114332430246.

It is an arithmetic number, because the mean of its divisors is an integer number (114332430246).

Almost surely, 2^228664860491 is an apocalyptic number.

228664860491 is a deficient number, since it is larger than the sum of its proper divisors (1).

228664860491 is an equidigital number, since it uses as much as digits as its factorization.

228664860491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7962624, while the sum is 56.

The spelling of 228664860491 in words is "two hundred twenty-eight billion, six hundred sixty-four million, eight hundred sixty thousand, four hundred ninety-one".