1202553661 has 4 divisors (see below), whose sum is σ = 1205494300. Its totient is φ = 1199613024.

The previous prime is 1202553641. The next prime is 1202553679. The reversal of 1202553661 is 1663552021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1663552021 = 227 ⋅7328423.

It can be written as a sum of positive squares in 2 ways, for example, as 1143724761 + 58828900 = 33819^2 + 7670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202553661 - 2¹⁹ = 1202029373 is a prime.

It is a super-2 number, since 2×1202553661² = 2892270615169005842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202553631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469706 + ... + 1470523.

It is an arithmetic number, because the mean of its divisors is an integer number (301373575).

Almost surely, 2^1202553661 is an apocalyptic number.

It is an amenable number.

1202553661 is a deficient number, since it is larger than the sum of its proper divisors (2940639).

1202553661 is an equidigital number, since it uses as much as digits as its factorization.

1202553661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940638.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1202553661 is about 34677.8554844442. The cubic root of 1202553661 is about 1063.4118322589.

The spelling of 1202553661 in words is "one billion, two hundred two million, five hundred fifty-three thousand, six hundred sixty-one".