51612061673 has 4 divisors (see below), whose sum is σ = 51613058640. Its totient is φ = 51611064708.

The previous prime is 51612061661. The next prime is 51612061687. The reversal of 51612061673 is 37616021615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37616021615 = 5 ⋅7523204323.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51612061673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51612061273) 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, 416315 + ... + 525872.

It is an arithmetic number, because the mean of its divisors is an integer number (12903264660).

Almost surely, 2^51612061673 is an apocalyptic number.

It is an amenable number.

51612061673 is a deficient number, since it is larger than the sum of its proper divisors (996967).

51612061673 is an equidigital number, since it uses as much as digits as its factorization.

51612061673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996966.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 51612061673 in words is "fifty-one billion, six hundred twelve million, sixty-one thousand, six hundred seventy-three".