1640880493279 has 4 divisors (see below), whose sum is σ = 1640918342376. Its totient is φ = 1640842644184.

The previous prime is 1640880493249. The next prime is 1640880493309. The reversal of 1640880493279 is 9723940880461.

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 (1640880493249) and next prime (1640880493309).

It is a cyclic number.

It is not a de Polignac number, because 1640880493279 - 2⁵ = 1640880493247 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 (1640880493249) 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, 18859444 + ... + 18946249.

It is an arithmetic number, because the mean of its divisors is an integer number (410229585594).

Almost surely, 2^{1640880493279} is an apocalyptic number.

1640880493279 is a deficient number, since it is larger than the sum of its proper divisors (37849097).

1640880493279 is an equidigital number, since it uses as much as digits as its factorization.

1640880493279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37849096.

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 1640880493279 in words is "one trillion, six hundred forty billion, eight hundred eighty million, four hundred ninety-three thousand, two hundred seventy-nine".