51165416447 has 4 divisors (see below), whose sum is σ = 51169562736. Its totient is φ = 51161270160.

The previous prime is 51165416347. The next prime is 51165416453. The reversal of 51165416447 is 74461456115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74461456115 = 5 ⋅14892291223.

It is a cyclic number.

It is not a de Polignac number, because 51165416447 - 2¹⁶ = 51165350911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51165416398 and 51165416407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51165416147) 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, 2054579 + ... + 2079332.

It is an arithmetic number, because the mean of its divisors is an integer number (12792390684).

Almost surely, 2^51165416447 is an apocalyptic number.

51165416447 is a deficient number, since it is larger than the sum of its proper divisors (4146289).

51165416447 is a wasteful number, since it uses less digits than its factorization.

51165416447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4146288.

The product of its digits is 403200, while the sum is 44.

The spelling of 51165416447 in words is "fifty-one billion, one hundred sixty-five million, four hundred sixteen thousand, four hundred forty-seven".