1989166801 has 8 divisors (see below), whose sum is σ = 2058706944. Its totient is φ = 1919962560.

The previous prime is 1989166793. The next prime is 1989166807. The reversal of 1989166801 is 1086619891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1989166801 - 2³ = 1989166793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989166807) 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, 71896 + ... + 95641.

It is an arithmetic number, because the mean of its divisors is an integer number (257338368).

Almost surely, 2^1989166801 is an apocalyptic number.

It is an amenable number.

1989166801 is a deficient number, since it is larger than the sum of its proper divisors (69540143).

1989166801 is a wasteful number, since it uses less digits than its factorization.

1989166801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167951.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 1989166801 is about 44600.0762443294. The cubic root of 1989166801 is about 1257.6421009677.

The spelling of 1989166801 in words is "one billion, nine hundred eighty-nine million, one hundred sixty-six thousand, eight hundred one".