2278485661 has 8 divisors (see below), whose sum is σ = 2335806648. Its totient is φ = 2221248000.

The previous prime is 2278485631. The next prime is 2278485721. The reversal of 2278485661 is 1665848722.

It can be written as a sum of positive squares in 4 ways, for example, as 62900761 + 2215584900 = 7931^2 + 47070^2 .

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 2278485661 - 2¹³ = 2278477469 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 (2278485631) 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, 36501 + ... + 76741.

It is an arithmetic number, because the mean of its divisors is an integer number (291975831).

Almost surely, 2^2278485661 is an apocalyptic number.

It is an amenable number.

2278485661 is a deficient number, since it is larger than the sum of its proper divisors (57320987).

2278485661 is a wasteful number, since it uses less digits than its factorization.

2278485661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41663.

The product of its digits is 1290240, while the sum is 49.

The square root of 2278485661 is about 47733.4857411440. The cubic root of 2278485661 is about 1315.8774158428.

The spelling of 2278485661 in words is "two billion, two hundred seventy-eight million, four hundred eighty-five thousand, six hundred sixty-one".