51989669737 has 4 divisors (see below), whose sum is σ = 52870850640. Its totient is φ = 51108488836.

The previous prime is 51989669731. The next prime is 51989669747. The reversal of 51989669737 is 73796698915.

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 not a de Polignac number, because 51989669737 - 2¹⁹ = 51989145449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51989669731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440590363 + ... + 440590480.

It is an arithmetic number, because the mean of its divisors is an integer number (13217712660).

Almost surely, 2^51989669737 is an apocalyptic number.

It is an amenable number.

51989669737 is a deficient number, since it is larger than the sum of its proper divisors (881180903).

51989669737 is an equidigital number, since it uses as much as digits as its factorization.

51989669737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881180902.

The product of its digits is 154314720, while the sum is 70.

The spelling of 51989669737 in words is "fifty-one billion, nine hundred eighty-nine million, six hundred sixty-nine thousand, seven hundred thirty-seven".