55400123370687 has 32 divisors (see below), whose sum is σ = 80040500179200. Its totient is φ = 33948363348480.

The previous prime is 55400123370617. The next prime is 55400123370703. The reversal of 55400123370687 is 78607332100455.

It is not a de Polignac number, because 55400123370687 - 2¹⁰ = 55400123369663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55400123370607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16658689 + ... + 19705637.

It is an arithmetic number, because the mean of its divisors is an integer number (2501265630600).

Almost surely, 2^{55400123370687} is an apocalyptic number.

55400123370687 is a deficient number, since it is larger than the sum of its proper divisors (24640376808513).

55400123370687 is a wasteful number, since it uses less digits than its factorization.

55400123370687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055303.

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 55400123370687 in words is "fifty-five trillion, four hundred billion, one hundred twenty-three million, three hundred seventy thousand, six hundred eighty-seven".