1640926894195 has 4 divisors (see below), whose sum is σ = 1969112273040. Its totient is φ = 1312741515352.

The previous prime is 1640926894193. The next prime is 1640926894199. The reversal of 1640926894195 is 5914986290461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640926894195 - 2¹ = 1640926894193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640926894193) 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, 164092689415 + ... + 164092689424.

It is an arithmetic number, because the mean of its divisors is an integer number (492278068260).

Almost surely, 2^{1640926894195} is an apocalyptic number.

1640926894195 is a deficient number, since it is larger than the sum of its proper divisors (328185378845).

1640926894195 is an equidigital number, since it uses as much as digits as its factorization.

1640926894195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328185378844.

The product of its (nonzero) digits is 33592320, while the sum is 64.

The spelling of 1640926894195 in words is "one trillion, six hundred forty billion, nine hundred twenty-six million, eight hundred ninety-four thousand, one hundred ninety-five".