1649201660 has 24 divisors (see below), whose sum is σ = 3613903776. Its totient is φ = 630998720.

The previous prime is 1649201657. The next prime is 1649201669. The reversal of 1649201660 is 661029461.

1649201660 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1649201660² = 5439732230693511200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1649201660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649201669) 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, 1792151 + ... + 1793070.

It is an arithmetic number, because the mean of its divisors is an integer number (150579324).

Almost surely, 2^1649201660 is an apocalyptic number.

1649201660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649201660 is an abundant number, since it is smaller than the sum of its proper divisors (1964702116).

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

1649201660 is a wasteful number, since it uses less digits than its factorization.

1649201660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585253 (or 3585251 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1649201660 is about 40610.3639481352. The cubic root of 1649201660 is about 1181.4751397152.

The spelling of 1649201660 in words is "one billion, six hundred forty-nine million, two hundred one thousand, six hundred sixty".