6340777642 has 8 divisors (see below), whose sum is σ = 9690622596. Its totient is φ = 3110570112.

The previous prime is 6340777631. The next prime is 6340777649. The reversal of 6340777642 is 2467770436.

It is a Cunningham number, because it is equal to 79629²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 6340777641 + 1 = 79629^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6340777642² = 80410922210574160328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6340777592 and 6340777601.

It is not an unprimeable number, because it can be changed into a prime (6340777649) 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, 29909223 + ... + 29909434.

Almost surely, 2^6340777642 is an apocalyptic number.

6340777642 is a deficient number, since it is larger than the sum of its proper divisors (3349844954).

6340777642 is a wasteful number, since it uses less digits than its factorization.

6340777642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59818712.

The product of its (nonzero) digits is 1185408, while the sum is 46.

The square root of 6340777642 is about 79629.0000062791. Note that the first 5 decimals coincide. The cubic root of 6340777642 is about 1850.8909895648.

The spelling of 6340777642 in words is "six billion, three hundred forty million, seven hundred seventy-seven thousand, six hundred forty-two".