1156523553 has 12 divisors (see below), whose sum is σ = 1672137168. Its totient is φ = 770275800.

The previous prime is 1156523551. The next prime is 1156523561. The reversal of 1156523553 is 3553256511.

1156523553 is a `hidden beast` number, since 1 + 1 + 56 + 52 + 3 + 553 = 666.

It is not a de Polignac number, because 1156523553 - 2¹ = 1156523551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1156523551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51675 + ... + 70592.

It is an arithmetic number, because the mean of its divisors is an integer number (139344764).

Almost surely, 2^1156523553 is an apocalyptic number.

It is an amenable number.

1156523553 is a deficient number, since it is larger than the sum of its proper divisors (515613615).

1156523553 is a wasteful number, since it uses less digits than its factorization.

1156523553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123324 (or 123321 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

The square root of 1156523553 is about 34007.6984372656. The cubic root of 1156523553 is about 1049.6668793601. Note that the first 3 decimals are identical.

The spelling of 1156523553 in words is "one billion, one hundred fifty-six million, five hundred twenty-three thousand, five hundred fifty-three".