51660601567 has 4 divisors (see below), whose sum is σ = 51793405560. Its totient is φ = 51527797576.

The previous prime is 51660601561. The next prime is 51660601583. The reversal of 51660601567 is 76510606615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51660601567 - 2⁷ = 51660601439 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 (51660601561) 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, 66401413 + ... + 66402190.

It is an arithmetic number, because the mean of its divisors is an integer number (12948351390).

Almost surely, 2^51660601567 is an apocalyptic number.

51660601567 is a deficient number, since it is larger than the sum of its proper divisors (132803993).

51660601567 is a wasteful number, since it uses less digits than its factorization.

51660601567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132803992.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 51660601567 in words is "fifty-one billion, six hundred sixty million, six hundred one thousand, five hundred sixty-seven".