23555566777 has 2 divisors, whose sum is σ = 23555566778. Its totient is φ = 23555566776.

The previous prime is 23555566757. The next prime is 23555566799. The reversal of 23555566777 is 77766555532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13062432681 + 10493134096 = 114291^2 + 102436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23555566777 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (23555566717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11777783388 + 11777783389.

It is an arithmetic number, because the mean of its divisors is an integer number (11777783389).

Almost surely, 2^23555566777 is an apocalyptic number.

It is an amenable number.

23555566777 is a deficient number, since it is larger than the sum of its proper divisors (1).

23555566777 is an equidigital number, since it uses as much as digits as its factorization.

23555566777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46305000, while the sum is 58.

The spelling of 23555566777 in words is "twenty-three billion, five hundred fifty-five million, five hundred sixty-six thousand, seven hundred seventy-seven".