23551517061649 has 2 divisors, whose sum is σ = 23551517061650. Its totient is φ = 23551517061648.

The previous prime is 23551517061629. The next prime is 23551517061703. The reversal of 23551517061649 is 94616071515532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22285763808400 + 1265753253249 = 4720780^2 + 1125057^2 .

It is a cyclic number.

It is not a de Polignac number, because 23551517061649 - 2⁷ = 23551517061521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23551517061649.

It is not a weakly prime, because it can be changed into another prime (23551517061619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11775758530824 + 11775758530825.

It is an arithmetic number, because the mean of its divisors is an integer number (11775758530825).

Almost surely, 2^{23551517061649} is an apocalyptic number.

It is an amenable number.

23551517061649 is a deficient number, since it is larger than the sum of its proper divisors (1).

23551517061649 is an equidigital number, since it uses as much as digits as its factorization.

23551517061649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 23551517061649 in words is "twenty-three trillion, five hundred fifty-one billion, five hundred seventeen million, sixty-one thousand, six hundred forty-nine".