51953587978 has 8 divisors (see below), whose sum is σ = 78997921668. Its totient is φ = 25620947424.

The previous prime is 51953587967. The next prime is 51953587991. The reversal of 51953587978 is 87978535915.

It can be written as a sum of positive squares in 2 ways, for example, as 46559713729 + 5393874249 = 215777^2 + 73443^2 .

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

It is a super-2 number, since 2×51953587978² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177923101 + ... + 177923392.

Almost surely, 2^51953587978 is an apocalyptic number.

51953587978 is a deficient number, since it is larger than the sum of its proper divisors (27044333690).

51953587978 is a wasteful number, since it uses less digits than its factorization.

51953587978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355846568.

The product of its digits is 95256000, while the sum is 67.

The spelling of 51953587978 in words is "fifty-one billion, nine hundred fifty-three million, five hundred eighty-seven thousand, nine hundred seventy-eight".