661767767166 has 32 divisors (see below), whose sum is σ = 1448784828288. Its totient is φ = 199851259040.

The previous prime is 661767767159. The next prime is 661767767183.

661767767166 is nontrivially palindromic in base 10.

661767767166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 661767767097 and 661767767106.

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, 17091216 + ... + 17129891.

It is an arithmetic number, because the mean of its divisors is an integer number (45274525884).

Almost surely, 2^661767767166 is an apocalyptic number.

661767767166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

661767767166 is an abundant number, since it is smaller than the sum of its proper divisors (787017061122).

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

661767767166 is a wasteful number, since it uses less digits than its factorization.

661767767166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34221416.

The product of its digits is 112021056, while the sum is 66.

The spelling of 661767767166 in words is "six hundred sixty-one billion, seven hundred sixty-seven million, seven hundred sixty-seven thousand, one hundred sixty-six".