2557778300797 has 4 divisors (see below), whose sum is σ = 2557793595996. Its totient is φ = 2557763005600.

The previous prime is 2557778300789. The next prime is 2557778300813. The reversal of 2557778300797 is 7970038777552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1299385688836 + 1258392611961 = 1139906^2 + 1121781^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557778300797 - 2³ = 2557778300789 is a prime.

It is a super-2 number, since 2×2557778300797² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557778300747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7393954 + ... + 7732147.

It is an arithmetic number, because the mean of its divisors is an integer number (639448398999).

Almost surely, 2^{2557778300797} is an apocalyptic number.

It is an amenable number.

2557778300797 is a deficient number, since it is larger than the sum of its proper divisors (15295199).

2557778300797 is a wasteful number, since it uses less digits than its factorization.

2557778300797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15295198.

The product of its (nonzero) digits is 181515600, while the sum is 67.

The spelling of 2557778300797 in words is "two trillion, five hundred fifty-seven billion, seven hundred seventy-eight million, three hundred thousand, seven hundred ninety-seven".