2780149643 has 2 divisors, whose sum is σ = 2780149644. Its totient is φ = 2780149642.

The previous prime is 2780149601. The next prime is 2780149717. The reversal of 2780149643 is 3469410872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2780149643 - 2¹² = 2780145547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2780149594 and 2780149603.

It is not a weakly prime, because it can be changed into another prime (2780139643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390074821 + 1390074822.

It is an arithmetic number, because the mean of its divisors is an integer number (1390074822).

Almost surely, 2^2780149643 is an apocalyptic number.

2780149643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780149643 is an equidigital number, since it uses as much as digits as its factorization.

2780149643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 2780149643 is about 52727.1243573931. The cubic root of 2780149643 is about 1406.1210967330.

The spelling of 2780149643 in words is "two billion, seven hundred eighty million, one hundred forty-nine thousand, six hundred forty-three".