1640345992641 has 8 divisors (see below), whose sum is σ = 2430142211360. Its totient is φ = 1093563995076.

The previous prime is 1640345992639. The next prime is 1640345992667. The reversal of 1640345992641 is 1462995430461.

1640345992641 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 3 + 4 + 599 + 2 + 6 + 41 = 666.

It is not a de Polignac number, because 1640345992641 - 2¹ = 1640345992639 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1640345990641) 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, 30376777615 + ... + 30376777668.

It is an arithmetic number, because the mean of its divisors is an integer number (303767776420).

Almost surely, 2^{1640345992641} is an apocalyptic number.

It is an amenable number.

1640345992641 is a deficient number, since it is larger than the sum of its proper divisors (789796218719).

1640345992641 is an equidigital number, since it uses as much as digits as its factorization.

1640345992641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60753555292 (or 60753555286 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 1640345992641 in words is "one trillion, six hundred forty billion, three hundred forty-five million, nine hundred ninety-two thousand, six hundred forty-one".