55431502123 has 4 divisors (see below), whose sum is σ = 55501936840. Its totient is φ = 55361067408.

The previous prime is 55431502121. The next prime is 55431502127. The reversal of 55431502123 is 32120513455.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55431502123 - 2¹ = 55431502121 is a prime.

It is a super-2 number, since 2×55431502123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55431502121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35216178 + ... + 35217751.

It is an arithmetic number, because the mean of its divisors is an integer number (13875484210).

Almost surely, 2^55431502123 is an apocalyptic number.

55431502123 is a deficient number, since it is larger than the sum of its proper divisors (70434717).

55431502123 is an equidigital number, since it uses as much as digits as its factorization.

55431502123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70434716.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 55431502123 in words is "fifty-five billion, four hundred thirty-one million, five hundred two thousand, one hundred twenty-three".