2780864478081 has 6 divisors (see below), whose sum is σ = 4016804246130. Its totient is φ = 1853909652048.

The previous prime is 2780864478079. The next prime is 2780864478103. The reversal of 2780864478081 is 1808744680872.

2780864478081 is a `hidden beast` number, since 2 + 7 + 8 + 0 + 86 + 4 + 478 + 0 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2747952713025 + 32911765056 = 1657695^2 + 181416^2 .

It is not a de Polignac number, because 2780864478081 - 2¹ = 2780864478079 is a prime.

It is a super-2 number, since 2×2780864478081² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2780864478001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154492470996 + ... + 154492471013.

It is an arithmetic number, because the mean of its divisors is an integer number (669467374355).

Almost surely, 2^{2780864478081} is an apocalyptic number.

It is an amenable number.

2780864478081 is a deficient number, since it is larger than the sum of its proper divisors (1235939768049).

2780864478081 is a wasteful number, since it uses less digits than its factorization.

2780864478081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308984942015 (or 308984942012 counting only the distinct ones).

The product of its (nonzero) digits is 38535168, while the sum is 63.

The spelling of 2780864478081 in words is "two trillion, seven hundred eighty billion, eight hundred sixty-four million, four hundred seventy-eight thousand, eighty-one".