23218649977 has 2 divisors, whose sum is σ = 23218649978. Its totient is φ = 23218649976.

The previous prime is 23218649959. The next prime is 23218650011. The reversal of 23218649977 is 77994681232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22424763001 + 793886976 = 149749^2 + 28176^2 .

It is a cyclic number.

It is not a de Polignac number, because 23218649977 - 2²³ = 23210261369 is a prime.

It is not a weakly prime, because it can be changed into another prime (23218649947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11609324988 + 11609324989.

It is an arithmetic number, because the mean of its divisors is an integer number (11609324989).

Almost surely, 2^23218649977 is an apocalyptic number.

It is an amenable number.

23218649977 is a deficient number, since it is larger than the sum of its proper divisors (1).

23218649977 is an equidigital number, since it uses as much as digits as its factorization.

23218649977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The spelling of 23218649977 in words is "twenty-three billion, two hundred eighteen million, six hundred forty-nine thousand, nine hundred seventy-seven".