1781048404306 has 4 divisors (see below), whose sum is σ = 2671572606462. Its totient is φ = 890524202152.

The previous prime is 1781048404279. The next prime is 1781048404307. The reversal of 1781048404306 is 6034048401871.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1092495300625 + 688553103681 = 1045225^2 + 829791^2 .

It is not an unprimeable number, because it can be changed into a prime (1781048404307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445262101075 + ... + 445262101078.

Almost surely, 2^{1781048404306} is an apocalyptic number.

1781048404306 is a deficient number, since it is larger than the sum of its proper divisors (890524202156).

1781048404306 is an equidigital number, since it uses as much as digits as its factorization.

1781048404306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890524202155.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 1781048404306 in words is "one trillion, seven hundred eighty-one billion, forty-eight million, four hundred four thousand, three hundred six".