2758378681 has 2 divisors, whose sum is σ = 2758378682. Its totient is φ = 2758378680.

The previous prime is 2758378633. The next prime is 2758378697. The reversal of 2758378681 is 1868738572.

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., 2756250000 + 2128681 = 52500^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 2758378681 - 2¹⁵ = 2758345913 is a prime.

It is a super-2 number, since 2×2758378681² = 15217305895590599522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2758378631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1379189340 + 1379189341.

It is an arithmetic number, because the mean of its divisors is an integer number (1379189341).

Almost surely, 2^2758378681 is an apocalyptic number.

It is an amenable number.

2758378681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2758378681 is an equidigital number, since it uses as much as digits as its factorization.

2758378681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 55.

The square root of 2758378681 is about 52520.2692395993. The cubic root of 2758378681 is about 1402.4410950484.

The spelling of 2758378681 in words is "two billion, seven hundred fifty-eight million, three hundred seventy-eight thousand, six hundred eighty-one".