1640975111791 has 4 divisors (see below), whose sum is σ = 1641110261472. Its totient is φ = 1640839962112.

The previous prime is 1640975111779. The next prime is 1640975111803. The reversal of 1640975111791 is 1971115790461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1640975111779) and next prime (1640975111803).

It is a cyclic number.

It is not a de Polignac number, because 1640975111791 - 2⁷ = 1640975111663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640975111771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67556626 + ... + 67580911.

It is an arithmetic number, because the mean of its divisors is an integer number (410277565368).

Almost surely, 2^{1640975111791} is an apocalyptic number.

1640975111791 is a deficient number, since it is larger than the sum of its proper divisors (135149681).

1640975111791 is a wasteful number, since it uses less digits than its factorization.

1640975111791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135149680.

The product of its (nonzero) digits is 476280, while the sum is 52.

The spelling of 1640975111791 in words is "one trillion, six hundred forty billion, nine hundred seventy-five million, one hundred eleven thousand, seven hundred ninety-one".