1781378240046 has 32 divisors (see below), whose sum is σ = 3569326311168. Its totient is φ = 592698603840.

The previous prime is 1781378239973. The next prime is 1781378240051. The reversal of 1781378240046 is 6400428731871.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8605071 + ... + 8809653.

It is an arithmetic number, because the mean of its divisors is an integer number (111541447224).

Almost surely, 2^{1781378240046} is an apocalyptic number.

1781378240046 is an abundant number, since it is smaller than the sum of its proper divisors (1787948071122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1781378240046 is a wasteful number, since it uses less digits than its factorization.

1781378240046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207256.

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 1781378240046 in words is "one trillion, seven hundred eighty-one billion, three hundred seventy-eight million, two hundred forty thousand, forty-six".