6541665654165 has 16 divisors (see below), whose sum is σ = 10804299403776. Its totient is φ = 3376343563200.

The previous prime is 6541665654079. The next prime is 6541665654229. The reversal of 6541665654165 is 5614565661456.

It is not a de Polignac number, because 6541665654165 - 2¹⁰ = 6541665653141 is a prime.

It is a super-3 number, since 3×6541665654165³ (a number of 39 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6541665654099 and 6541665654108.

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, 7034048626 + ... + 7034049555.

It is an arithmetic number, because the mean of its divisors is an integer number (675268712736).

Almost surely, 2^{6541665654165} is an apocalyptic number.

It is an amenable number.

6541665654165 is a deficient number, since it is larger than the sum of its proper divisors (4262633749611).

6541665654165 is a wasteful number, since it uses less digits than its factorization.

6541665654165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14068098220.

The product of its digits is 77760000, while the sum is 60.

The spelling of 6541665654165 in words is "six trillion, five hundred forty-one billion, six hundred sixty-five million, six hundred fifty-four thousand, one hundred sixty-five".