6377801665 has 8 divisors (see below), whose sum is σ = 7653838248. Its totient is φ = 5101923840.

The previous prime is 6377801663. The next prime is 6377801669. The reversal of 6377801665 is 5661087736.

It can be written as a sum of positive squares in 4 ways, for example, as 1724242576 + 4653559089 = 41524^2 + 68217^2 .

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

It is not a de Polignac number, because 6377801665 - 2¹ = 6377801663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6377801663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83409 + ... + 140401.

It is an arithmetic number, because the mean of its divisors is an integer number (956729781).

Almost surely, 2^6377801665 is an apocalyptic number.

It is an amenable number.

6377801665 is a deficient number, since it is larger than the sum of its proper divisors (1276036583).

6377801665 is a wasteful number, since it uses less digits than its factorization.

6377801665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79379.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 6377801665 is about 79861.1398929417. The cubic root of 6377801665 is about 1854.4864730315.

The spelling of 6377801665 in words is "six billion, three hundred seventy-seven million, eight hundred one thousand, six hundred sixty-five".