51431432555 has 4 divisors (see below), whose sum is σ = 61717719072. Its totient is φ = 41145146040.

The previous prime is 51431432513. The next prime is 51431432653. The reversal of 51431432555 is 55523413415.

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

It is a de Polignac number, because none of the positive numbers 2^k-51431432555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5143143251 + ... + 5143143260.

It is an arithmetic number, because the mean of its divisors is an integer number (15429429768).

Almost surely, 2^51431432555 is an apocalyptic number.

51431432555 is a deficient number, since it is larger than the sum of its proper divisors (10286286517).

51431432555 is a wasteful number, since it uses less digits than its factorization.

51431432555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10286286516.

The product of its digits is 180000, while the sum is 38.

The spelling of 51431432555 in words is "fifty-one billion, four hundred thirty-one million, four hundred thirty-two thousand, five hundred fifty-five".