55551577515555 has 64 divisors (see below), whose sum is σ = 97420378019328. Its totient is φ = 26807153295360.

The previous prime is 55551577515509. The next prime is 55551577515557.

55551577515555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55551577515555 - 2¹² = 55551577511459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55551577515557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50897272 + ... + 51977258.

It is an arithmetic number, because the mean of its divisors is an integer number (1522193406552).

Almost surely, 2^{55551577515555} is an apocalyptic number.

55551577515555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55551577515555 is a deficient number, since it is larger than the sum of its proper divisors (41868800503773).

55551577515555 is a wasteful number, since it uses less digits than its factorization.

55551577515555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081476.

The product of its digits is 478515625, while the sum is 66.

The spelling of 55551577515555 in words is "fifty-five trillion, five hundred fifty-one billion, five hundred seventy-seven million, five hundred fifteen thousand, five hundred fifty-five".