3877120661 has 4 divisors (see below), whose sum is σ = 3887920800. Its totient is φ = 3866320524.

The previous prime is 3877120613. The next prime is 3877120669. The reversal of 3877120661 is 1660217783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1660217783 = 7 ⋅237173969.

It is a cyclic number.

It is not a de Polignac number, because 3877120661 - 2¹⁴ = 3877104277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3877120669) 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, 5399531 + ... + 5400248.

It is an arithmetic number, because the mean of its divisors is an integer number (971980200).

Almost surely, 2^3877120661 is an apocalyptic number.

It is an amenable number.

3877120661 is a deficient number, since it is larger than the sum of its proper divisors (10800139).

3877120661 is a wasteful number, since it uses less digits than its factorization.

3877120661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800138.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 3877120661 is about 62266.5292191559. The cubic root of 3877120661 is about 1570.9768031223.

The spelling of 3877120661 in words is "three billion, eight hundred seventy-seven million, one hundred twenty thousand, six hundred sixty-one".