51947668061 has 4 divisors (see below), whose sum is σ = 51978066300. Its totient is φ = 51917269824.

The previous prime is 51947668057. The next prime is 51947668103. The reversal of 51947668061 is 16086674915.

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 7135011961 + 44812656100 = 84469^2 + 211690^2 .

It is a cyclic number.

It is not a de Polignac number, because 51947668061 - 2² = 51947668057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51947667994 and 51947668012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51947668001) 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, 15196556 + ... + 15199973.

It is an arithmetic number, because the mean of its divisors is an integer number (12994516575).

Almost surely, 2^51947668061 is an apocalyptic number.

It is an amenable number.

51947668061 is a deficient number, since it is larger than the sum of its proper divisors (30398239).

51947668061 is a wasteful number, since it uses less digits than its factorization.

51947668061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30398238.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 51947668061 in words is "fifty-one billion, nine hundred forty-seven million, six hundred sixty-eight thousand, sixty-one".