166261256377 has 8 divisors (see below), whose sum is σ = 167738602496. Its totient is φ = 164786538672.

The previous prime is 166261256347. The next prime is 166261256393. The reversal of 166261256377 is 773652162661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166261256377 is a prime.

It is a super-2 number, since 2×166261256377² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166261256327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529923 + ... + 783160.

It is an arithmetic number, because the mean of its divisors is an integer number (20967325312).

Almost surely, 2^166261256377 is an apocalyptic number.

It is an amenable number.

166261256377 is a deficient number, since it is larger than the sum of its proper divisors (1477346119).

166261256377 is a wasteful number, since it uses less digits than its factorization.

166261256377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314207.

The product of its digits is 3810240, while the sum is 52.

The spelling of 166261256377 in words is "one hundred sixty-six billion, two hundred sixty-one million, two hundred fifty-six thousand, three hundred seventy-seven".