1780138302725 has 6 divisors (see below), whose sum is σ = 2207371495410. Its totient is φ = 1424110642160.

The previous prime is 1780138302721. The next prime is 1780138302749. The reversal of 1780138302725 is 5272038310871.

It can be written as a sum of positive squares in 3 ways, for example, as 546543789796 + 1233594512929 = 739286^2 + 1110673^2 .

It is not a de Polignac number, because 1780138302725 - 2² = 1780138302721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1780138302725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780138302721) 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, 35602766030 + ... + 35602766079.

It is an arithmetic number, because the mean of its divisors is an integer number (367895249235).

Almost surely, 2^{1780138302725} is an apocalyptic number.

It is an amenable number.

1780138302725 is a deficient number, since it is larger than the sum of its proper divisors (427233192685).

1780138302725 is an equidigital number, since it uses as much as digits as its factorization.

1780138302725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71205532119 (or 71205532114 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 1780138302725 in words is "one trillion, seven hundred eighty billion, one hundred thirty-eight million, three hundred two thousand, seven hundred twenty-five".