1666432650 has 48 divisors (see below), whose sum is σ = 4375862784. Its totient is φ = 418241280.

The previous prime is 1666432631. The next prime is 1666432661. The reversal of 1666432650 is 562346661.

It is a junction number, because it is equal to n+sod(n) for n = 1666432599 and 1666432608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324202 + ... + 329301.

It is an arithmetic number, because the mean of its divisors is an integer number (91163808).

Almost surely, 2^1666432650 is an apocalyptic number.

1666432650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666432650 is an abundant number, since it is smaller than the sum of its proper divisors (2709430134).

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

1666432650 is a wasteful number, since it uses less digits than its factorization.

1666432650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653535 (or 653530 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 1666432650 is about 40821.9628386485. The cubic root of 1666432650 is about 1185.5756074116.

The spelling of 1666432650 in words is "one billion, six hundred sixty-six million, four hundred thirty-two thousand, six hundred fifty".