51980779469 has 4 divisors (see below), whose sum is σ = 52069333344. Its totient is φ = 51892225596.

The previous prime is 51980779463. The next prime is 51980779471. The reversal of 51980779469 is 96497708915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51980779469 is a prime.

It is a super-2 number, since 2×51980779469² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51980779463) 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, 44276057 + ... + 44277230.

It is an arithmetic number, because the mean of its divisors is an integer number (13017333336).

Almost surely, 2^51980779469 is an apocalyptic number.

It is an amenable number.

51980779469 is a deficient number, since it is larger than the sum of its proper divisors (88553875).

51980779469 is an equidigital number, since it uses as much as digits as its factorization.

51980779469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88553874.

The product of its (nonzero) digits is 34292160, while the sum is 65.

The spelling of 51980779469 in words is "fifty-one billion, nine hundred eighty million, seven hundred seventy-nine thousand, four hundred sixty-nine".