51597753981 has 8 divisors (see below), whose sum is σ = 70396935840. Its totient is φ = 33598537392.

The previous prime is 51597753979. The next prime is 51597754003. The reversal of 51597753981 is 18935779515.

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

It is not a de Polignac number, because 51597753981 - 2¹ = 51597753979 is a prime.

It is a super-2 number, since 2×51597753981² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51597753941) 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, 199991166 + ... + 199991423.

It is an arithmetic number, because the mean of its divisors is an integer number (8799616980).

Almost surely, 2^51597753981 is an apocalyptic number.

It is an amenable number.

51597753981 is a deficient number, since it is larger than the sum of its proper divisors (18799181859).

51597753981 is a wasteful number, since it uses less digits than its factorization.

51597753981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399982635.

The product of its digits is 11907000, while the sum is 60.

The spelling of 51597753981 in words is "fifty-one billion, five hundred ninety-seven million, seven hundred fifty-three thousand, nine hundred eighty-one".