11557720243 has 2 divisors, whose sum is σ = 11557720244. Its totient is φ = 11557720242.

The previous prime is 11557720219. The next prime is 11557720253. The reversal of 11557720243 is 34202775511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11557720243 - 2⁵ = 11557720211 is a prime.

It is not a weakly prime, because it can be changed into another prime (11557720253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5778860121 + 5778860122.

It is an arithmetic number, because the mean of its divisors is an integer number (5778860122).

Almost surely, 2^11557720243 is an apocalyptic number.

11557720243 is a deficient number, since it is larger than the sum of its proper divisors (1).

11557720243 is an equidigital number, since it uses as much as digits as its factorization.

11557720243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 11557720243 in words is "eleven billion, five hundred fifty-seven million, seven hundred twenty thousand, two hundred forty-three".