51611543463 has 4 divisors (see below), whose sum is σ = 68815391288. Its totient is φ = 34407695640.

The previous prime is 51611543461. The next prime is 51611543549. The reversal of 51611543463 is 36434511615.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51611543463 - 2¹ = 51611543461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51611543461) 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, 8601923908 + ... + 8601923913.

It is an arithmetic number, because the mean of its divisors is an integer number (17203847822).

Almost surely, 2^51611543463 is an apocalyptic number.

51611543463 is a deficient number, since it is larger than the sum of its proper divisors (17203847825).

51611543463 is a wasteful number, since it uses less digits than its factorization.

51611543463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17203847824.

The product of its digits is 129600, while the sum is 39.

The spelling of 51611543463 in words is "fifty-one billion, six hundred eleven million, five hundred forty-three thousand, four hundred sixty-three".