1166619655 has 4 divisors (see below), whose sum is σ = 1399943592. Its totient is φ = 933295720.

The previous prime is 1166619653. The next prime is 1166619659. The reversal of 1166619655 is 5569166611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5569166611 = 2069 ⋅2691719.

It is not a de Polignac number, because 1166619655 - 2¹ = 1166619653 is a prime.

It is a super-2 number, since 2×1166619655² = 2722002838864638050, 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 (1166619653) 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, 116661961 + ... + 116661970.

It is an arithmetic number, because the mean of its divisors is an integer number (349985898).

Almost surely, 2^1166619655 is an apocalyptic number.

1166619655 is a deficient number, since it is larger than the sum of its proper divisors (233323937).

1166619655 is an equidigital number, since it uses as much as digits as its factorization.

1166619655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233323936.

The product of its digits is 291600, while the sum is 46.

The square root of 1166619655 is about 34155.8143659319. The cubic root of 1166619655 is about 1052.7124592960.

The spelling of 1166619655 in words is "one billion, one hundred sixty-six million, six hundred nineteen thousand, six hundred fifty-five".