1166638073 has 4 divisors (see below), whose sum is σ = 1235263860. Its totient is φ = 1098012288.

The previous prime is 1166638069. The next prime is 1166638087. The reversal of 1166638073 is 3708366611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3708366611 = 41603 ⋅89137.

It can be written as a sum of positive squares in 2 ways, for example, as 643738384 + 522899689 = 25372^2 + 22867^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166638073 - 2² = 1166638069 is a prime.

It is a super-2 number, since 2×1166638073² = 2722088786746306658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1166638073.

It is not an unprimeable number, because it can be changed into a prime (1166638043) 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, 34312868 + ... + 34312901.

It is an arithmetic number, because the mean of its divisors is an integer number (308815965).

Almost surely, 2^1166638073 is an apocalyptic number.

It is an amenable number.

1166638073 is a deficient number, since it is larger than the sum of its proper divisors (68625787).

1166638073 is an equidigital number, since it uses as much as digits as its factorization.

1166638073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68625786.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 1166638073 is about 34156.0839822132. The cubic root of 1166638073 is about 1052.7179991639.

The spelling of 1166638073 in words is "one billion, one hundred sixty-six million, six hundred thirty-eight thousand, seventy-three".