2077378621 has 2 divisors, whose sum is σ = 2077378622. Its totient is φ = 2077378620.

The previous prime is 2077378609. The next prime is 2077378643. The reversal of 2077378621 is 1268737702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1449324900 + 628053721 = 38070^2 + 25061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2077378621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2077378021) 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 as a sum of consecutive naturals, namely, 1038689310 + 1038689311.

It is an arithmetic number, because the mean of its divisors is an integer number (1038689311).

Almost surely, 2^2077378621 is an apocalyptic number.

It is an amenable number.

2077378621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2077378621 is an equidigital number, since it uses as much as digits as its factorization.

2077378621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 2077378621 is about 45578.2691751234. The cubic root of 2077378621 is about 1275.9643855342.

The spelling of 2077378621 in words is "two billion, seventy-seven million, three hundred seventy-eight thousand, six hundred twenty-one".