51651957081 has 8 divisors (see below), whose sum is σ = 68870480224. Its totient is φ = 34434036000.

The previous prime is 51651957067. The next prime is 51651957103. The reversal of 51651957081 is 18075915615.

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

It is not a de Polignac number, because 51651957081 - 2³⁰ = 50578215257 is a prime.

It is a super-2 number, since 2×51651957081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51651957081.

It is not an unprimeable number, because it can be changed into a prime (51651957061) 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, 118206 + ... + 342456.

It is an arithmetic number, because the mean of its divisors is an integer number (8608810028).

Almost surely, 2^51651957081 is an apocalyptic number.

It is an amenable number.

51651957081 is a deficient number, since it is larger than the sum of its proper divisors (17218523143).

51651957081 is a wasteful number, since it uses less digits than its factorization.

51651957081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301031.

The product of its (nonzero) digits is 378000, while the sum is 48.

The spelling of 51651957081 in words is "fifty-one billion, six hundred fifty-one million, nine hundred fifty-seven thousand, eighty-one".