23661155116639 has 2 divisors, whose sum is σ = 23661155116640. Its totient is φ = 23661155116638.

The previous prime is 23661155116619. The next prime is 23661155116681. The reversal of 23661155116639 is 93661155116632.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23661155116639 - 2²¹ = 23661153019487 is a prime.

It is a super-2 number, since 2×23661155116639² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23661155116639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23661155116609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11830577558319 + 11830577558320.

It is an arithmetic number, because the mean of its divisors is an integer number (11830577558320).

Almost surely, 2^{23661155116639} is an apocalyptic number.

23661155116639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23661155116639 is an equidigital number, since it uses as much as digits as its factorization.

23661155116639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 55.

The spelling of 23661155116639 in words is "twenty-three trillion, six hundred sixty-one billion, one hundred fifty-five million, one hundred sixteen thousand, six hundred thirty-nine".