51386519481 has 8 divisors (see below), whose sum is σ = 74744028384. Its totient is φ = 31143345120.

The previous prime is 51386519473. The next prime is 51386519489. The reversal of 51386519481 is 18491568315.

It is an interprime number because it is at equal distance from previous prime (51386519473) and next prime (51386519489).

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

It is not a de Polignac number, because 51386519481 - 2³ = 51386519473 is a prime.

It is a super-2 number, since 2×51386519481² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51386519489) 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, 778583596 + ... + 778583661.

It is an arithmetic number, because the mean of its divisors is an integer number (9343003548).

Almost surely, 2^51386519481 is an apocalyptic number.

It is an amenable number.

51386519481 is a deficient number, since it is larger than the sum of its proper divisors (23357508903).

51386519481 is a wasteful number, since it uses less digits than its factorization.

51386519481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557167271.

The product of its digits is 1036800, while the sum is 51.

The spelling of 51386519481 in words is "fifty-one billion, three hundred eighty-six million, five hundred nineteen thousand, four hundred eighty-one".