2178076413509 has 6 divisors (see below), whose sum is σ = 2298745467270. Its totient is φ = 2063440812456.

The previous prime is 2178076413437. The next prime is 2178076413533. The reversal of 2178076413509 is 9053146708712.

It can be written as a sum of positive squares in only one way, i.e., 2053050525409 + 125025888100 = 1432847^2 + 353590^2 .

It is not a de Polignac number, because 2178076413509 - 2²⁴ = 2178059636293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178076413559) 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, 3016725974 + ... + 3016726695.

It is an arithmetic number, because the mean of its divisors is an integer number (383124244545).

It is a 1-persistent number, because it is pandigital, but 2⋅2178076413509 = 4356152827018 is not.

Almost surely, 2^{2178076413509} is an apocalyptic number.

It is an amenable number.

2178076413509 is a deficient number, since it is larger than the sum of its proper divisors (120669053761).

2178076413509 is an equidigital number, since it uses as much as digits as its factorization.

2178076413509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6033452707 (or 6033452688 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 2178076413509 in words is "two trillion, one hundred seventy-eight billion, seventy-six million, four hundred thirteen thousand, five hundred nine".