1166521658 has 4 divisors (see below), whose sum is σ = 1749782490. Its totient is φ = 583260828.

The previous prime is 1166521639. The next prime is 1166521669. The reversal of 1166521658 is 8561256611.

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

It can be written as a sum of positive squares in only one way, i.e., 1166427409 + 94249 = 34153^2 + 307^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 291630413 + ... + 291630416.

Almost surely, 2^1166521658 is an apocalyptic number.

1166521658 is a deficient number, since it is larger than the sum of its proper divisors (583260832).

1166521658 is an equidigital number, since it uses as much as digits as its factorization.

1166521658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583260831.

The product of its digits is 86400, while the sum is 41.

The square root of 1166521658 is about 34154.3797777093. The cubic root of 1166521658 is about 1052.6829822364.

The spelling of 1166521658 in words is "one billion, one hundred sixty-six million, five hundred twenty-one thousand, six hundred fifty-eight".