51537521365447 has 16 divisors (see below), whose sum is σ = 56555351260128. Its totient is φ = 46670374707840.

The previous prime is 51537521365427. The next prime is 51537521365489. The reversal of 51537521365447 is 74456312573515.

It is not a de Polignac number, because 51537521365447 - 2³¹ = 51535373881799 is a prime.

It is a super-2 number, since 2×51537521365447² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51537521365391 and 51537521365400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51537521365427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2197572 + ... + 10387702.

It is an arithmetic number, because the mean of its divisors is an integer number (3534709453758).

Almost surely, 2^{51537521365447} is an apocalyptic number.

51537521365447 is a deficient number, since it is larger than the sum of its proper divisors (5017829894681).

51537521365447 is a wasteful number, since it uses less digits than its factorization.

51537521365447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8199330.

The product of its digits is 52920000, while the sum is 58.

The spelling of 51537521365447 in words is "fifty-one trillion, five hundred thirty-seven billion, five hundred twenty-one million, three hundred sixty-five thousand, four hundred forty-seven".