1157556643 has 2 divisors, whose sum is σ = 1157556644. Its totient is φ = 1157556642.

The previous prime is 1157556641. The next prime is 1157556661. The reversal of 1157556643 is 3466557511.

It is a weak prime.

It is an emirp because it is prime and its reverse (3466557511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1157556643 - 2¹ = 1157556641 is a prime.

Together with 1157556641, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1157556643.

It is not a weakly prime, because it can be changed into another prime (1157556641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578778321 + 578778322.

It is an arithmetic number, because the mean of its divisors is an integer number (578778322).

Almost surely, 2^1157556643 is an apocalyptic number.

1157556643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157556643 is an equidigital number, since it uses as much as digits as its factorization.

1157556643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 43.

The square root of 1157556643 is about 34022.8841076120. The cubic root of 1157556643 is about 1049.9793323218.

The spelling of 1157556643 in words is "one billion, one hundred fifty-seven million, five hundred fifty-six thousand, six hundred forty-three".