51548069765 has 8 divisors (see below), whose sum is σ = 61962000408. Its totient is φ = 41168911360.

The previous prime is 51548069761. The next prime is 51548069789. The reversal of 51548069765 is 56796084515.

It is a Cunningham number, because it is equal to 227042²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 18557523076 + 32990546689 = 136226^2 + 181633^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51548069765 - 2² = 51548069761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51548069765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51548069761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8689796 + ... + 8695725.

It is an arithmetic number, because the mean of its divisors is an integer number (7745250051).

Almost surely, 2^51548069765 is an apocalyptic number.

It is an amenable number.

51548069765 is a deficient number, since it is larger than the sum of its proper divisors (10413930643).

51548069765 is a wasteful number, since it uses less digits than its factorization.

51548069765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17386119.

The product of its (nonzero) digits is 9072000, while the sum is 56.

The spelling of 51548069765 in words is "fifty-one billion, five hundred forty-eight million, sixty-nine thousand, seven hundred sixty-five".