1666649622 has 32 divisors (see below), whose sum is σ = 3648063744. Its totient is φ = 503415200.

The previous prime is 1666649617. The next prime is 1666649623. The reversal of 1666649622 is 2269466661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666649623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20073 + ... + 61124.

It is an arithmetic number, because the mean of its divisors is an integer number (114001992).

Almost surely, 2^1666649622 is an apocalyptic number.

1666649622 is an abundant number, since it is smaller than the sum of its proper divisors (1981414122).

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

1666649622 is a wasteful number, since it uses less digits than its factorization.

1666649622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81524.

The product of its digits is 1119744, while the sum is 48.

The square root of 1666649622 is about 40824.6202921717. The cubic root of 1666649622 is about 1185.6270597455.

The spelling of 1666649622 in words is "one billion, six hundred sixty-six million, six hundred forty-nine thousand, six hundred twenty-two".