1166455421 has 8 divisors (see below), whose sum is σ = 1176880320. Its totient is φ = 1156071808.

The previous prime is 1166455399. The next prime is 1166455427. The reversal of 1166455421 is 1245546611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166455421 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 (1166455427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47885 + ... + 68013.

It is an arithmetic number, because the mean of its divisors is an integer number (147110040).

Almost surely, 2^1166455421 is an apocalyptic number.

It is an amenable number.

1166455421 is a deficient number, since it is larger than the sum of its proper divisors (10424899).

1166455421 is a wasteful number, since it uses less digits than its factorization.

1166455421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20643.

The product of its digits is 28800, while the sum is 35.

The square root of 1166455421 is about 34153.4100932835. The cubic root of 1166455421 is about 1052.6630575077.

The spelling of 1166455421 in words is "one billion, one hundred sixty-six million, four hundred fifty-five thousand, four hundred twenty-one".