2756378557 has 2 divisors, whose sum is σ = 2756378558. Its totient is φ = 2756378556.

The previous prime is 2756378549. The next prime is 2756378567. The reversal of 2756378557 is 7558736572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2302944121 + 453434436 = 47989^2 + 21294^2 .

It is a cyclic number.

It is not a de Polignac number, because 2756378557 - 2³ = 2756378549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2756378498 and 2756378507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2756378567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378189278 + 1378189279.

It is an arithmetic number, because the mean of its divisors is an integer number (1378189279).

Almost surely, 2^2756378557 is an apocalyptic number.

It is an amenable number.

2756378557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2756378557 is an equidigital number, since it uses as much as digits as its factorization.

2756378557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12348000, while the sum is 55.

The square root of 2756378557 is about 52501.2243381047. The cubic root of 2756378557 is about 1402.1020390689.

The spelling of 2756378557 in words is "two billion, seven hundred fifty-six million, three hundred seventy-eight thousand, five hundred fifty-seven".