51871790879 has 4 divisors (see below), whose sum is σ = 52454620080. Its totient is φ = 51288961680.

The previous prime is 51871790869. The next prime is 51871790899. The reversal of 51871790879 is 97809717815.

It is a happy number.

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 51871790879 - 2¹² = 51871786783 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 (51871790809) 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, 291414467 + ... + 291414644.

It is an arithmetic number, because the mean of its divisors is an integer number (13113655020).

Almost surely, 2^51871790879 is an apocalyptic number.

51871790879 is a deficient number, since it is larger than the sum of its proper divisors (582829201).

51871790879 is an equidigital number, since it uses as much as digits as its factorization.

51871790879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582829200.

The product of its (nonzero) digits is 8890560, while the sum is 62.

The spelling of 51871790879 in words is "fifty-one billion, eight hundred seventy-one million, seven hundred ninety thousand, eight hundred seventy-nine".