51981673537 has 8 divisors (see below), whose sum is σ = 52757212032. Its totient is φ = 51207340800.

The previous prime is 51981673409. The next prime is 51981673553. The reversal of 51981673537 is 73537618915.

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

It is a cyclic number.

It is not a de Polignac number, because 51981673537 - 2⁷ = 51981673409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51981673567) 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, 214389 + ... + 387202.

It is an arithmetic number, because the mean of its divisors is an integer number (6594651504).

Almost surely, 2^51981673537 is an apocalyptic number.

It is an amenable number.

51981673537 is a deficient number, since it is larger than the sum of its proper divisors (775538495).

51981673537 is a wasteful number, since it uses less digits than its factorization.

51981673537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602879.

The product of its digits is 4762800, while the sum is 55.

The spelling of 51981673537 in words is "fifty-one billion, nine hundred eighty-one million, six hundred seventy-three thousand, five hundred thirty-seven".