55166777766155 has 16 divisors (see below), whose sum is σ = 72596433696768. Its totient is φ = 39911233788000.

The previous prime is 55166777766131. The next prime is 55166777766167.

55166777766155 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55166777766155 - 2¹⁰ = 55166777765131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2625728561 + ... + 2625749570.

It is an arithmetic number, because the mean of its divisors is an integer number (4537277106048).

Almost surely, 2^{55166777766155} is an apocalyptic number.

55166777766155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55166777766155 is a deficient number, since it is larger than the sum of its proper divisors (17429655930613).

55166777766155 is a wasteful number, since it uses less digits than its factorization.

55166777766155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251478338.

The product of its digits is 1944810000, while the sum is 74.

The spelling of 55166777766155 in words is "fifty-five trillion, one hundred sixty-six billion, seven hundred seventy-seven million, seven hundred sixty-six thousand, one hundred fifty-five".