6440777741 has 2 divisors, whose sum is σ = 6440777742. Its totient is φ = 6440777740.

The previous prime is 6440777723. The next prime is 6440777767. The reversal of 6440777741 is 1477770446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6439420516 + 1357225 = 80246^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440777741 is a prime.

It is a super-2 number, since 2×6440777741² = 82967235817922126162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6340777741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220388870 + 3220388871.

It is an arithmetic number, because the mean of its divisors is an integer number (3220388871).

Almost surely, 2^6440777741 is an apocalyptic number.

It is an amenable number.

6440777741 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440777741 is an equidigital number, since it uses as much as digits as its factorization.

6440777741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 921984, while the sum is 47.

The square root of 6440777741 is about 80254.4562064936. The cubic root of 6440777741 is about 1860.5703863081.

The spelling of 6440777741 in words is "six billion, four hundred forty million, seven hundred seventy-seven thousand, seven hundred forty-one".