2400778661 has 8 divisors (see below), whose sum is σ = 2414672640. Its totient is φ = 2386917232.

The previous prime is 2400778651. The next prime is 2400778691. The reversal of 2400778661 is 1668770042.

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 2400778661 - 2¹⁴ = 2400762277 is a prime.

It is a super-2 number, since 2×2400778661² = 11527476358225905842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2400778631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148376 + ... + 163758.

It is an arithmetic number, because the mean of its divisors is an integer number (301834080).

Almost surely, 2^2400778661 is an apocalyptic number.

It is an amenable number.

2400778661 is a deficient number, since it is larger than the sum of its proper divisors (13893979).

2400778661 is a wasteful number, since it uses less digits than its factorization.

2400778661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16275.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 2400778661 is about 48997.7413867211. The cubic root of 2400778661 is about 1339.0106793220.

The spelling of 2400778661 in words is "two billion, four hundred million, seven hundred seventy-eight thousand, six hundred sixty-one".