1681078463569 has 4 divisors (see below), whose sum is σ = 1686157250800. Its totient is φ = 1675999676340.

The previous prime is 1681078463489. The next prime is 1681078463621. The reversal of 1681078463569 is 9653648701861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681078463569 is a prime.

It is a super-2 number, since 2×1681078463569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681078463569.

It is not an unprimeable number, because it can be changed into a prime (1681078460569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2539393119 + ... + 2539393780.

It is an arithmetic number, because the mean of its divisors is an integer number (421539312700).

Almost surely, 2^{1681078463569} is an apocalyptic number.

It is an amenable number.

1681078463569 is a deficient number, since it is larger than the sum of its proper divisors (5078787231).

1681078463569 is an equidigital number, since it uses as much as digits as its factorization.

1681078463569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078787230.

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 1681078463569 in words is "one trillion, six hundred eighty-one billion, seventy-eight million, four hundred sixty-three thousand, five hundred sixty-nine".