55431309511 has 4 divisors (see below), whose sum is σ = 56190642592. Its totient is φ = 54671976432.

The previous prime is 55431309491. The next prime is 55431309523. The reversal of 55431309511 is 11590313455.

It is a happy number.

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

It is not a de Polignac number, because 55431309511 - 2¹⁵ = 55431276743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55431309541) 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, 379666431 + ... + 379666576.

It is an arithmetic number, because the mean of its divisors is an integer number (14047660648).

Almost surely, 2^55431309511 is an apocalyptic number.

55431309511 is a deficient number, since it is larger than the sum of its proper divisors (759333081).

55431309511 is an equidigital number, since it uses as much as digits as its factorization.

55431309511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759333080.

The product of its (nonzero) digits is 40500, while the sum is 37.

The spelling of 55431309511 in words is "fifty-five billion, four hundred thirty-one million, three hundred nine thousand, five hundred eleven".