1642671763 has 4 divisors (see below), whose sum is σ = 1667189320. Its totient is φ = 1618154208.

The previous prime is 1642671739. The next prime is 1642671827. The reversal of 1642671763 is 3671762461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3671762461 = 53 ⋅69278537.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642671763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642674763) 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, 12258678 + ... + 12258811.

It is an arithmetic number, because the mean of its divisors is an integer number (416797330).

Almost surely, 2^1642671763 is an apocalyptic number.

1642671763 is a deficient number, since it is larger than the sum of its proper divisors (24517557).

1642671763 is an equidigital number, since it uses as much as digits as its factorization.

1642671763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24517556.

The product of its digits is 254016, while the sum is 43.

The square root of 1642671763 is about 40529.8872808697. The cubic root of 1642671763 is about 1179.9137548284.

The spelling of 1642671763 in words is "one billion, six hundred forty-two million, six hundred seventy-one thousand, seven hundred sixty-three".