51125155308461 has 4 divisors (see below), whose sum is σ = 55057859562972. Its totient is φ = 47192451053952.

The previous prime is 51125155308449. The next prime is 51125155308503. The reversal of 51125155308461 is 16480355152115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16738072905961 + 34387082402500 = 4091219^2 + 5864050^2 .

It is a cyclic number.

It is not a de Polignac number, because 51125155308461 - 2¹⁴ = 51125155292077 is a prime.

It is a super-2 number, since 2×51125155308461² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51125155308401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966352127236 + ... + 1966352127261.

It is an arithmetic number, because the mean of its divisors is an integer number (13764464890743).

Almost surely, 2^{51125155308461} is an apocalyptic number.

It is an amenable number.

51125155308461 is a deficient number, since it is larger than the sum of its proper divisors (3932704254511).

51125155308461 is a wasteful number, since it uses less digits than its factorization.

51125155308461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932704254510.

The product of its (nonzero) digits is 720000, while the sum is 47.

The spelling of 51125155308461 in words is "fifty-one trillion, one hundred twenty-five billion, one hundred fifty-five million, three hundred eight thousand, four hundred sixty-one".