7814649641 has 4 divisors (see below), whose sum is σ = 8274334932. Its totient is φ = 7354964352.

The previous prime is 7814649617. The next prime is 7814649643. The reversal of 7814649641 is 1469464187.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6956394025 + 858255616 = 83405^2 + 29296^2 .

It is a cyclic number.

It is not a de Polignac number, because 7814649641 - 2¹⁴ = 7814633257 is a prime.

It is a super-2 number, since 2×7814649641² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7814649641.

It is not an unprimeable number, because it can be changed into a prime (7814649643) 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, 229842620 + ... + 229842653.

It is an arithmetic number, because the mean of its divisors is an integer number (2068583733).

Almost surely, 2^7814649641 is an apocalyptic number.

It is an amenable number.

7814649641 is a deficient number, since it is larger than the sum of its proper divisors (459685291).

7814649641 is a wasteful number, since it uses less digits than its factorization.

7814649641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459685290.

The product of its digits is 1161216, while the sum is 50.

The square root of 7814649641 is about 88400.5070177768. The cubic root of 7814649641 is about 1984.4332898647.

The spelling of 7814649641 in words is "seven billion, eight hundred fourteen million, six hundred forty-nine thousand, six hundred forty-one".