1640427892663 has 4 divisors (see below), whose sum is σ = 1874774734480. Its totient is φ = 1406081050848.

The previous prime is 1640427892657. The next prime is 1640427892673. The reversal of 1640427892663 is 3662987240461.

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 1640427892663 - 2²¹ = 1640425795511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640427892598 and 1640427892607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640427892673) 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, 117173420898 + ... + 117173420911.

It is an arithmetic number, because the mean of its divisors is an integer number (468693683620).

Almost surely, 2^{1640427892663} is an apocalyptic number.

1640427892663 is a deficient number, since it is larger than the sum of its proper divisors (234346841817).

1640427892663 is an equidigital number, since it uses as much as digits as its factorization.

1640427892663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234346841816.

The product of its (nonzero) digits is 20901888, while the sum is 58.

The spelling of 1640427892663 in words is "one trillion, six hundred forty billion, four hundred twenty-seven million, eight hundred ninety-two thousand, six hundred sixty-three".