11721602257 has 8 divisors (see below), whose sum is σ = 12039838376. Its totient is φ = 11403441792.

The previous prime is 11721602237. The next prime is 11721602281. The reversal of 11721602257 is 75220612711.

It can be written as a sum of positive squares in 4 ways, for example, as 9595377936 + 2126224321 = 97956^2 + 46111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11721602257 - 2²³ = 11713213649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11721602237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451843 + ... + 477079.

It is an arithmetic number, because the mean of its divisors is an integer number (1504979797).

Almost surely, 2^11721602257 is an apocalyptic number.

It is an amenable number.

11721602257 is a deficient number, since it is larger than the sum of its proper divisors (318236119).

11721602257 is a wasteful number, since it uses less digits than its factorization.

11721602257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37827.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 11721602257 in words is "eleven billion, seven hundred twenty-one million, six hundred two thousand, two hundred fifty-seven".