1640317641 has 16 divisors (see below), whose sum is σ = 2316699648. Its totient is φ = 1028793600.

The previous prime is 1640317639. The next prime is 1640317661. The reversal of 1640317641 is 1467130461.

It is not a de Polignac number, because 1640317641 - 2¹ = 1640317639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640317621) 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 15 ways as a sum of consecutive naturals, for example, 157176 + ... + 167286.

It is an arithmetic number, because the mean of its divisors is an integer number (144793728).

Almost surely, 2^1640317641 is an apocalyptic number.

It is an amenable number.

1640317641 is a deficient number, since it is larger than the sum of its proper divisors (676382007).

1640317641 is a wasteful number, since it uses less digits than its factorization.

1640317641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13312.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1640317641 is about 40500.8350654650. The cubic root of 1640317641 is about 1179.3498383800.

The spelling of 1640317641 in words is "one billion, six hundred forty million, three hundred seventeen thousand, six hundred forty-one".