2649666816 has 90 divisors (see below), whose sum is σ = 7900888842. Its totient is φ = 883215360.

The previous prime is 2649666797. The next prime is 2649666823. The reversal of 2649666816 is 6186669462.

2649666816 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1743897600 + 905769216 = 41760^2 + 30096^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43155 + ... + 84626.

Almost surely, 2^2649666816 is an apocalyptic number.

It is an amenable number.

2649666816 is an abundant number, since it is smaller than the sum of its proper divisors (5251222026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2649666816 is an equidigital number, since it uses as much as digits as its factorization.

2649666816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127809 (or 127786 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 2649666816 is about 51474.9144341202. The cubic root of 2649666816 is about 1383.7695050900.

The spelling of 2649666816 in words is "two billion, six hundred forty-nine million, six hundred sixty-six thousand, eight hundred sixteen".