1778380076465 has 8 divisors (see below), whose sum is σ = 2135304818280. Its totient is φ = 1421871576832.

The previous prime is 1778380076453. The next prime is 1778380076489. The reversal of 1778380076465 is 5646700838771.

It can be written as a sum of positive squares in 4 ways, for example, as 56521734049 + 1721858342416 = 237743^2 + 1312196^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1778380076465 - 2¹² = 1778380072369 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1778380076398 and 1778380076407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104051144 + ... + 104068233.

It is an arithmetic number, because the mean of its divisors is an integer number (266913102285).

Almost surely, 2^{1778380076465} is an apocalyptic number.

It is an amenable number.

1778380076465 is a deficient number, since it is larger than the sum of its proper divisors (356924741815).

1778380076465 is a wasteful number, since it uses less digits than its factorization.

1778380076465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208121091.

The product of its (nonzero) digits is 47416320, while the sum is 62.

The spelling of 1778380076465 in words is "one trillion, seven hundred seventy-eight billion, three hundred eighty million, seventy-six thousand, four hundred sixty-five".