1661201364 has 12 divisors (see below), whose sum is σ = 3876136544. Its totient is φ = 553733784.

The previous prime is 1661201357. The next prime is 1661201401. The reversal of 1661201364 is 4631021661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69216712 + ... + 69216735.

Almost surely, 2^1661201364 is an apocalyptic number.

It is an amenable number.

1661201364 is an abundant number, since it is smaller than the sum of its proper divisors (2214935180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661201364 is a wasteful number, since it uses less digits than its factorization.

1661201364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138433454 (or 138433452 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1661201364 is about 40757.8380682784. The cubic root of 1661201364 is about 1184.3337157763. Note that the first 3 decimals are identical.

The spelling of 1661201364 in words is "one billion, six hundred sixty-one million, two hundred one thousand, three hundred sixty-four".