6781490060161 has 4 divisors (see below), whose sum is σ = 6783444946900. Its totient is φ = 6779535173424.

The previous prime is 6781490060159. The next prime is 6781490060171. The reversal of 6781490060161 is 1610600941876.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3631997408400 + 3149492651761 = 1905780^2 + 1774681^2 .

It is a cyclic number.

It is not a de Polignac number, because 6781490060161 - 2¹ = 6781490060159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6781490060131) 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, 977438166 + ... + 977445103.

It is an arithmetic number, because the mean of its divisors is an integer number (1695861236725).

Almost surely, 2^{6781490060161} is an apocalyptic number.

It is an amenable number.

6781490060161 is a deficient number, since it is larger than the sum of its proper divisors (1954886739).

6781490060161 is a wasteful number, since it uses less digits than its factorization.

6781490060161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954886738.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 6781490060161 in words is "six trillion, seven hundred eighty-one billion, four hundred ninety million, sixty thousand, one hundred sixty-one".