55172071507 has 48 divisors (see below), whose sum is σ = 68630732352. Its totient is φ = 44068147200.

The previous prime is 55172071489. The next prime is 55172071511. The reversal of 55172071507 is 70517027155.

It is not a de Polignac number, because 55172071507 - 2³¹ = 53024587859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55172071507.

It is not an unprimeable number, because it can be changed into a prime (55172071517) 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 47 ways as a sum of consecutive naturals, for example, 54463533 + ... + 54464545.

It is an arithmetic number, because the mean of its divisors is an integer number (1429806924).

Almost surely, 2^55172071507 is an apocalyptic number.

55172071507 is a deficient number, since it is larger than the sum of its proper divisors (13458660845).

55172071507 is a wasteful number, since it uses less digits than its factorization.

55172071507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 85750, while the sum is 40.

The spelling of 55172071507 in words is "fifty-five billion, one hundred seventy-two million, seventy-one thousand, five hundred seven".