1164643553 has 4 divisors (see below), whose sum is σ = 1165422000. Its totient is φ = 1163865108.

The previous prime is 1164643549. The next prime is 1164643577. The reversal of 1164643553 is 3553464611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3553464611 = 2749 ⋅1292639.

It is a cyclic number.

It is not a de Polignac number, because 1164643553 - 2² = 1164643549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1164640553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386975 + ... + 389972.

It is an arithmetic number, because the mean of its divisors is an integer number (291355500).

Almost surely, 2^1164643553 is an apocalyptic number.

It is an amenable number.

1164643553 is a deficient number, since it is larger than the sum of its proper divisors (778447).

1164643553 is an equidigital number, since it uses as much as digits as its factorization.

1164643553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778446.

The product of its digits is 129600, while the sum is 38.

The square root of 1164643553 is about 34126.8743514550. The cubic root of 1164643553 is about 1052.1177373684.

The spelling of 1164643553 in words is "one billion, one hundred sixty-four million, six hundred forty-three thousand, five hundred fifty-three".