1161203566 has 4 divisors (see below), whose sum is σ = 1741805352. Its totient is φ = 580601782.

The previous prime is 1161203551. The next prime is 1161203579. The reversal of 1161203566 is 6653021611.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1161203566² = 2696787443382232712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 290300890 + ... + 290300893.

It is an arithmetic number, because the mean of its divisors is an integer number (435451338).

Almost surely, 2^1161203566 is an apocalyptic number.

1161203566 is a deficient number, since it is larger than the sum of its proper divisors (580601786).

1161203566 is an equidigital number, since it uses as much as digits as its factorization.

1161203566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580601785.

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

The square root of 1161203566 is about 34076.4371083598. The cubic root of 1161203566 is about 1051.0808419792.

The spelling of 1161203566 in words is "one billion, one hundred sixty-one million, two hundred three thousand, five hundred sixty-six".