51085085353061 has 4 divisors (see below), whose sum is σ = 52732991332224. Its totient is φ = 49437179373900.

The previous prime is 51085085353037. The next prime is 51085085353091. The reversal of 51085085353061 is 16035358058015.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51085085353061 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 (51085085353091) 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, 823952989535 + ... + 823952989596.

It is an arithmetic number, because the mean of its divisors is an integer number (13183247833056).

Almost surely, 2^{51085085353061} is an apocalyptic number.

It is an amenable number.

51085085353061 is a deficient number, since it is larger than the sum of its proper divisors (1647905979163).

51085085353061 is a wasteful number, since it uses less digits than its factorization.

51085085353061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647905979162.

The product of its (nonzero) digits is 2160000, while the sum is 50.

The spelling of 51085085353061 in words is "fifty-one trillion, eighty-five billion, eighty-five million, three hundred fifty-three thousand, sixty-one".