1649106278820 has 432 divisors, whose sum is σ = 6836300347968. Its totient is φ = 316311851520.

The previous prime is 1649106278819. The next prime is 1649106278843. The reversal of 1649106278820 is 288726019461.

It is a happy number.

1649106278820 is a `hidden beast` number, since 1 + 6 + 4 + 9 + 1 + 0 + 627 + 8 + 8 + 2 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 607507 + ... + 1915013.

It is an arithmetic number, because the mean of its divisors is an integer number (15824769324).

Almost surely, 2^{1649106278820} is an apocalyptic number.

1649106278820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649106278820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3418150173984).

1649106278820 is an abundant number, since it is smaller than the sum of its proper divisors (5187194069148).

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

1649106278820 is a wasteful number, since it uses less digits than its factorization.

1649106278820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307560 (or 1307548 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 1649106278820 in words is "one trillion, six hundred forty-nine billion, one hundred six million, two hundred seventy-eight thousand, eight hundred twenty".