1640260665346 has 16 divisors (see below), whose sum is σ = 2650182732288. Its totient is φ = 759166927200.

The previous prime is 1640260665271. The next prime is 1640260665383. The reversal of 1640260665346 is 6435660620461.

It is a self number, because there is not a number n which added to its sum of digits gives 1640260665346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575125035 + ... + 575127886.

It is an arithmetic number, because the mean of its divisors is an integer number (165636420768).

Almost surely, 2^{1640260665346} is an apocalyptic number.

1640260665346 is a deficient number, since it is larger than the sum of its proper divisors (1009922066942).

1640260665346 is a wasteful number, since it uses less digits than its factorization.

1640260665346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150252977.

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 1640260665346 in words is "one trillion, six hundred forty billion, two hundred sixty million, six hundred sixty-five thousand, three hundred forty-six".