1640980485 has 64 divisors (see below), whose sum is σ = 2962310400. Its totient is φ = 861808896.

The previous prime is 1640980483. The next prime is 1640980489. The reversal of 1640980485 is 5840890461.

1640980485 is a `hidden beast` number, since 164 + 0 + 9 + 8 + 0 + 485 = 666.

It is not a de Polignac number, because 1640980485 - 2¹ = 1640980483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1640980485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640980483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2945827 + ... + 2946383.

It is an arithmetic number, because the mean of its divisors is an integer number (46286100).

Almost surely, 2^1640980485 is an apocalyptic number.

1640980485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640980485 is a deficient number, since it is larger than the sum of its proper divisors (1321329915).

1640980485 is a wasteful number, since it uses less digits than its factorization.

1640980485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1640980485 is about 40509.0173294786. The cubic root of 1640980485 is about 1179.5086734071.

The spelling of 1640980485 in words is "one billion, six hundred forty million, nine hundred eighty thousand, four hundred eighty-five".