2778753641 has 2 divisors, whose sum is σ = 2778753642. Its totient is φ = 2778753640.

The previous prime is 2778753619. The next prime is 2778753661. The reversal of 2778753641 is 1463578772.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2648131600 + 130622041 = 51460^2 + 11429^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778753641 - 2¹⁴ = 2778737257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2778753641.

It is not a weakly prime, because it can be changed into another prime (2778753661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389376820 + 1389376821.

It is an arithmetic number, because the mean of its divisors is an integer number (1389376821).

Almost surely, 2^2778753641 is an apocalyptic number.

It is an amenable number.

2778753641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778753641 is an equidigital number, since it uses as much as digits as its factorization.

2778753641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975680, while the sum is 50.

The square root of 2778753641 is about 52713.8847079211. The cubic root of 2778753641 is about 1405.8857045467.

The spelling of 2778753641 in words is "two billion, seven hundred seventy-eight million, seven hundred fifty-three thousand, six hundred forty-one".