6691477154161 has 4 divisors (see below), whose sum is σ = 6691854943972. Its totient is φ = 6691099364352.

The previous prime is 6691477154099. The next prime is 6691477154221. The reversal of 6691477154161 is 1614517741966.

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 2520410256400 + 4171066897761 = 1587580^2 + 2042319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6691477154161 is a prime.

It is a super-2 number, since 2×6691477154161² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6691477154096 and 6691477154105.

It is not an unprimeable number, because it can be changed into a prime (6691477157161) 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, 188868336 + ... + 188903761.

It is an arithmetic number, because the mean of its divisors is an integer number (1672963735993).

Almost surely, 2^{6691477154161} is an apocalyptic number.

It is an amenable number.

6691477154161 is a deficient number, since it is larger than the sum of its proper divisors (377789811).

6691477154161 is a wasteful number, since it uses less digits than its factorization.

6691477154161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377789810.

The product of its digits is 7620480, while the sum is 58.

The spelling of 6691477154161 in words is "six trillion, six hundred ninety-one billion, four hundred seventy-seven million, one hundred fifty-four thousand, one hundred sixty-one".