11597720957 has 2 divisors, whose sum is σ = 11597720958. Its totient is φ = 11597720956.

The previous prime is 11597720947. The next prime is 11597721001. The reversal of 11597720957 is 75902779511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7054152121 + 4543568836 = 83989^2 + 67406^2 .

It is a cyclic number.

It is not a de Polignac number, because 11597720957 - 2⁴ = 11597720941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11597720899 and 11597720908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11597720947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5798860478 + 5798860479.

It is an arithmetic number, because the mean of its divisors is an integer number (5798860479).

Almost surely, 2^11597720957 is an apocalyptic number.

It is an amenable number.

11597720957 is a deficient number, since it is larger than the sum of its proper divisors (1).

11597720957 is an equidigital number, since it uses as much as digits as its factorization.

11597720957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1389150, while the sum is 53.

The spelling of 11597720957 in words is "eleven billion, five hundred ninety-seven million, seven hundred twenty thousand, nine hundred fifty-seven".