1661677358766 has 32 divisors (see below), whose sum is σ = 3329611971840. Its totient is φ = 552849945984.

The previous prime is 1661677358707. The next prime is 1661677358791. The reversal of 1661677358766 is 6678537761661.

It is a super-2 number, since 2×1661677358766² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1661677358766.

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, 19237711 + ... + 19323893.

It is an arithmetic number, because the mean of its divisors is an integer number (104050374120).

Almost surely, 2^{1661677358766} is an apocalyptic number.

1661677358766 is an abundant number, since it is smaller than the sum of its proper divisors (1667934613074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661677358766 is a wasteful number, since it uses less digits than its factorization.

1661677358766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92200.

The product of its digits is 320060160, while the sum is 69.

The spelling of 1661677358766 in words is "one trillion, six hundred sixty-one billion, six hundred seventy-seven million, three hundred fifty-eight thousand, seven hundred sixty-six".