2780005255553 has 4 divisors (see below), whose sum is σ = 2847810261828. Its totient is φ = 2712200249280.

The previous prime is 2780005255543. The next prime is 2780005255591. The reversal of 2780005255553 is 3555525000872.

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 1269987001969 + 1510018253584 = 1126937^2 + 1228828^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780005255553 - 2²⁸ = 2779736820097 is a prime.

It is a super-3 number, since 3×2780005255553³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2780005255498 and 2780005255507.

It is not an unprimeable number, because it can be changed into a prime (2780005255543) 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, 33902503076 + ... + 33902503157.

It is an arithmetic number, because the mean of its divisors is an integer number (711952565457).

Almost surely, 2^{2780005255553} is an apocalyptic number.

It is an amenable number.

2780005255553 is a deficient number, since it is larger than the sum of its proper divisors (67805006275).

2780005255553 is an equidigital number, since it uses as much as digits as its factorization.

2780005255553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67805006274.

The product of its (nonzero) digits is 2100000, while the sum is 47.

The spelling of 2780005255553 in words is "two trillion, seven hundred eighty billion, five million, two hundred fifty-five thousand, five hundred fifty-three".