42166779566 has 32 divisors (see below), whose sum is σ = 69929552448. Its totient is φ = 18967674880.

The previous prime is 42166779559. The next prime is 42166779619. The reversal of 42166779566 is 66597766124.

It is a Curzon number.

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, 1197086 + ... + 1231806.

It is an arithmetic number, because the mean of its divisors is an integer number (2185298514).

Almost surely, 2^42166779566 is an apocalyptic number.

42166779566 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

42166779566 is a deficient number, since it is larger than the sum of its proper divisors (27762772882).

42166779566 is a wasteful number, since it uses less digits than its factorization.

42166779566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36316.

The product of its digits is 22861440, while the sum is 59.

The spelling of 42166779566 in words is "forty-two billion, one hundred sixty-six million, seven hundred seventy-nine thousand, five hundred sixty-six".