665116767611566 has 16 divisors (see below), whose sum is σ = 1014063465971808. Its totient is φ = 327117247027200.

The previous prime is 665116767611539. The next prime is 665116767611599.

It is a happy number.

665116767611566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665116767611495 and 665116767611504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5408623155 + ... + 5408746126.

It is an arithmetic number, because the mean of its divisors is an integer number (63378966623238).

Almost surely, 2^{665116767611566} is an apocalyptic number.

665116767611566 is a deficient number, since it is larger than the sum of its proper divisors (348946698360242).

665116767611566 is a wasteful number, since it uses less digits than its factorization.

665116767611566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10817369787.

The product of its digits is 342921600, while the sum is 70.

The spelling of 665116767611566 in words is "six hundred sixty-five trillion, one hundred sixteen billion, seven hundred sixty-seven million, six hundred eleven thousand, five hundred sixty-six".