51957187061 has 4 divisors (see below), whose sum is σ = 55953893772. Its totient is φ = 47960480352.

The previous prime is 51957187019. The next prime is 51957187099. The reversal of 51957187061 is 16078175915.

51957187061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 29757975025 + 22199212036 = 172505^2 + 148994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51957187061 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 (51957187361) 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, 1998353336 + ... + 1998353361.

It is an arithmetic number, because the mean of its divisors is an integer number (13988473443).

Almost surely, 2^51957187061 is an apocalyptic number.

It is an amenable number.

51957187061 is a deficient number, since it is larger than the sum of its proper divisors (3996706711).

51957187061 is a wasteful number, since it uses less digits than its factorization.

51957187061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996706710.

The product of its (nonzero) digits is 529200, while the sum is 50.

The spelling of 51957187061 in words is "fifty-one billion, nine hundred fifty-seven million, one hundred eighty-seven thousand, sixty-one".