55121566512155 has 32 divisors (see below), whose sum is σ = 77715573743808. Its totient is φ = 37001959948800.

The previous prime is 55121566512121. The next prime is 55121566512161.

55121566512155 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55121566512155 - 2⁶ = 55121566512091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6886925 + ... + 12556785.

It is an arithmetic number, because the mean of its divisors is an integer number (2428611679494).

Almost surely, 2^{55121566512155} is an apocalyptic number.

55121566512155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55121566512155 is a deficient number, since it is larger than the sum of its proper divisors (22594007231653).

55121566512155 is a wasteful number, since it uses less digits than its factorization.

55121566512155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683487.

The product of its digits is 2250000, while the sum is 50.

The spelling of 55121566512155 in words is "fifty-five trillion, one hundred twenty-one billion, five hundred sixty-six million, five hundred twelve thousand, one hundred fifty-five".