1201166653 has 4 divisors (see below), whose sum is σ = 1201250620. Its totient is φ = 1201082688.

The previous prime is 1201166633. The next prime is 1201166731. The reversal of 1201166653 is 3566611021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 770728644 + 430438009 = 27762^2 + 20747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201166653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201166633) 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, 14550 + ... + 51127.

It is an arithmetic number, because the mean of its divisors is an integer number (300312655).

Almost surely, 2^1201166653 is an apocalyptic number.

It is an amenable number.

1201166653 is a deficient number, since it is larger than the sum of its proper divisors (83967).

1201166653 is an equidigital number, since it uses as much as digits as its factorization.

1201166653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83966.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1201166653 is about 34657.8512461462. The cubic root of 1201166653 is about 1063.0028336985.

Adding to 1201166653 its reverse (3566611021), we get a palindrome (4767777674).

The spelling of 1201166653 in words is "one billion, two hundred one million, one hundred sixty-six thousand, six hundred fifty-three".