51147602477 has 4 divisors (see below), whose sum is σ = 51155783196. Its totient is φ = 51139421760.

The previous prime is 51147602411. The next prime is 51147602509. The reversal of 51147602477 is 77420674115.

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 39592642441 + 11554960036 = 198979^2 + 107494^2 .

It is a cyclic number.

It is not a de Polignac number, because 51147602477 - 2²⁴ = 51130825261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51147632477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4080974 + ... + 4093487.

It is an arithmetic number, because the mean of its divisors is an integer number (12788945799).

Almost surely, 2^51147602477 is an apocalyptic number.

It is an amenable number.

51147602477 is a deficient number, since it is larger than the sum of its proper divisors (8180719).

51147602477 is an equidigital number, since it uses as much as digits as its factorization.

51147602477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8180718.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 51147602477 in words is "fifty-one billion, one hundred forty-seven million, six hundred two thousand, four hundred seventy-seven".