55687355378655 has 64 divisors (see below), whose sum is σ = 119630458579968. Its totient is φ = 21362581877760.

The previous prime is 55687355378623. The next prime is 55687355378713.

55687355378655 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55687355378655 - 2⁵ = 55687355378623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1854375774 + ... + 1854405803.

It is an arithmetic number, because the mean of its divisors is an integer number (1869225915312).

Almost surely, 2^{55687355378655} is an apocalyptic number.

55687355378655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55687355378655 is an abundant number, since it is smaller than the sum of its proper divisors (63943103201313).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55687355378655 is a wasteful number, since it uses less digits than its factorization.

55687355378655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708781616.

The product of its digits is 15876000000, while the sum is 78.

The spelling of 55687355378655 in words is "fifty-five trillion, six hundred eighty-seven billion, three hundred fifty-five million, three hundred seventy-eight thousand, six hundred fifty-five".