8378445661 has 8 divisors (see below), whose sum is σ = 8452226880. Its totient is φ = 8304964512.

The previous prime is 8378445659. The next prime is 8378445679. The reversal of 8378445661 is 1665448738.

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 8378445661 - 2¹ = 8378445659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8378445599 and 8378445608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8378445601) 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, 18745 + ... + 130798.

It is an arithmetic number, because the mean of its divisors is an integer number (1056528360).

Almost surely, 2^8378445661 is an apocalyptic number.

It is an amenable number.

8378445661 is a deficient number, since it is larger than the sum of its proper divisors (73781219).

8378445661 is a wasteful number, since it uses less digits than its factorization.

8378445661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150035.

The product of its digits is 3870720, while the sum is 52.

The square root of 8378445661 is about 91533.8498097835. The cubic root of 8378445661 is about 2031.0525138862.

The spelling of 8378445661 in words is "eight billion, three hundred seventy-eight million, four hundred forty-five thousand, six hundred sixty-one".