6541665654166 has 4 divisors (see below), whose sum is σ = 9812498481252. Its totient is φ = 3270832827082.

The previous prime is 6541665654079. The next prime is 6541665654229. The reversal of 6541665654166 is 6614565661456.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1635416413540 + ... + 1635416413543.

It is an arithmetic number, because the mean of its divisors is an integer number (2453124620313).

Almost surely, 2^{6541665654166} is an apocalyptic number.

6541665654166 is a deficient number, since it is larger than the sum of its proper divisors (3270832827086).

6541665654166 is a wasteful number, since it uses less digits than its factorization.

6541665654166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270832827085.

The product of its digits is 93312000, while the sum is 61.

The spelling of 6541665654166 in words is "six trillion, five hundred forty-one billion, six hundred sixty-five million, six hundred fifty-four thousand, one hundred sixty-six".