1663420140 has 36 divisors (see below), whose sum is σ = 5045708304. Its totient is φ = 443578656.

The previous prime is 1663420139. The next prime is 1663420153. The reversal of 1663420140 is 410243661.

1663420140 is a `hidden beast` number, since 1 + 6 + 634 + 20 + 1 + 4 + 0 = 666.

1663420140 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4620432 + ... + 4620791.

It is an arithmetic number, because the mean of its divisors is an integer number (140158564).

Almost surely, 2^1663420140 is an apocalyptic number.

1663420140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663420140 is an abundant number, since it is smaller than the sum of its proper divisors (3382288164).

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

1663420140 is a wasteful number, since it uses less digits than its factorization.

1663420140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9241238 (or 9241233 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1663420140 is about 40785.0479955584. The cubic root of 1663420140 is about 1184.8607644985.

The spelling of 1663420140 in words is "one billion, six hundred sixty-three million, four hundred twenty thousand, one hundred forty".