3777775661 has 8 divisors (see below), whose sum is σ = 4254152448. Its totient is φ = 3323556000.

The previous prime is 3777775657. The next prime is 3777775663. The reversal of 3777775661 is 1665777773.

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

It is a cyclic number.

It is not a de Polignac number, because 3777775661 - 2² = 3777775657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3777775597 and 3777775606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3777775663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5538920 + ... + 5539601.

It is an arithmetic number, because the mean of its divisors is an integer number (531769056).

Almost surely, 2^3777775661 is an apocalyptic number.

3777775661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3777775661 is a deficient number, since it is larger than the sum of its proper divisors (476376787).

3777775661 is a wasteful number, since it uses less digits than its factorization.

3777775661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11078563.

The product of its digits is 9075780, while the sum is 56.

The square root of 3777775661 is about 61463.6124955245. The cubic root of 3777775661 is about 1557.4426185611.

The spelling of 3777775661 in words is "three billion, seven hundred seventy-seven million, seven hundred seventy-five thousand, six hundred sixty-one".