55138090187 has 8 divisors (see below), whose sum is σ = 57580484256. Its totient is φ = 52699453312.

The previous prime is 55138090151. The next prime is 55138090219. The reversal of 55138090187 is 78109083155.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55138090187 - 2¹⁸ = 55137828043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55138090127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 909278 + ... + 968019.

It is an arithmetic number, because the mean of its divisors is an integer number (7197560532).

Almost surely, 2^55138090187 is an apocalyptic number.

55138090187 is a deficient number, since it is larger than the sum of its proper divisors (2442394069).

55138090187 is a wasteful number, since it uses less digits than its factorization.

55138090187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878597.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 55138090187 in words is "fifty-five billion, one hundred thirty-eight million, ninety thousand, one hundred eighty-seven".