1640869187874 has 32 divisors (see below), whose sum is σ = 3750649825920. Its totient is φ = 468808307712.

The previous prime is 1640869187851. The next prime is 1640869187879. The reversal of 1640869187874 is 4787819680461.

It is a junction number, because it is equal to n+sod(n) for n = 1640869187799 and 1640869187808.

It is not an unprimeable number, because it can be changed into a prime (1640869187879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342722 + ... + 2254914.

It is an arithmetic number, because the mean of its divisors is an integer number (117207807060).

Almost surely, 2^{1640869187874} is an apocalyptic number.

1640869187874 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1640869187874 is an abundant number, since it is smaller than the sum of its proper divisors (2109780638046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640869187874 is a wasteful number, since it uses less digits than its factorization.

1640869187874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955034.

The product of its (nonzero) digits is 130056192, while the sum is 69.

The spelling of 1640869187874 in words is "one trillion, six hundred forty billion, eight hundred sixty-nine million, one hundred eighty-seven thousand, eight hundred seventy-four".