55172071509 has 4 divisors (see below), whose sum is σ = 73562762016. Its totient is φ = 36781381004.

The previous prime is 55172071489. The next prime is 55172071511. The reversal of 55172071509 is 90517027155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55172071509 - 2¹¹ = 55172069461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55172071519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9195345249 + ... + 9195345254.

It is an arithmetic number, because the mean of its divisors is an integer number (18390690504).

Almost surely, 2^55172071509 is an apocalyptic number.

It is an amenable number.

55172071509 is a deficient number, since it is larger than the sum of its proper divisors (18390690507).

55172071509 is a wasteful number, since it uses less digits than its factorization.

55172071509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390690506.

The product of its (nonzero) digits is 110250, while the sum is 42.

The spelling of 55172071509 in words is "fifty-five billion, one hundred seventy-two million, seventy-one thousand, five hundred nine".