51647164742 has 4 divisors (see below), whose sum is σ = 77470747116. Its totient is φ = 25823582370.

The previous prime is 51647164739. The next prime is 51647164747. The reversal of 51647164742 is 24746174615.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51647164747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12911791184 + ... + 12911791187.

It is an arithmetic number, because the mean of its divisors is an integer number (19367686779).

Almost surely, 2^51647164742 is an apocalyptic number.

51647164742 is a deficient number, since it is larger than the sum of its proper divisors (25823582374).

51647164742 is a wasteful number, since it uses less digits than its factorization.

51647164742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25823582373.

The product of its digits is 1128960, while the sum is 47.

The spelling of 51647164742 in words is "fifty-one billion, six hundred forty-seven million, one hundred sixty-four thousand, seven hundred forty-two".