11721503669 has 2 divisors, whose sum is σ = 11721503670. Its totient is φ = 11721503668.

The previous prime is 11721503659. The next prime is 11721503681. The reversal of 11721503669 is 96630512711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11187292900 + 534210769 = 105770^2 + 23113^2 .

It is a cyclic number.

It is not a de Polignac number, because 11721503669 - 2⁸ = 11721503413 is a prime.

It is a super-2 number, since 2×11721503669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11721503609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860751834 + 5860751835.

It is an arithmetic number, because the mean of its divisors is an integer number (5860751835).

Almost surely, 2^11721503669 is an apocalyptic number.

It is an amenable number.

11721503669 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721503669 is an equidigital number, since it uses as much as digits as its factorization.

11721503669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 11721503669 in words is "eleven billion, seven hundred twenty-one million, five hundred three thousand, six hundred sixty-nine".