51646207747 has 8 divisors (see below), whose sum is σ = 51917443200. Its totient is φ = 51375654144.

The previous prime is 51646207733. The next prime is 51646207771. The reversal of 51646207747 is 74770264615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51646207747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51646207747.

It is not an unprimeable number, because it can be changed into a prime (51646207447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18222 + ... + 321907.

It is an arithmetic number, because the mean of its divisors is an integer number (6489680400).

Almost surely, 2^51646207747 is an apocalyptic number.

51646207747 is a deficient number, since it is larger than the sum of its proper divisors (271235453).

51646207747 is a wasteful number, since it uses less digits than its factorization.

51646207747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340925.

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 51646207747 in words is "fifty-one billion, six hundred forty-six million, two hundred seven thousand, seven hundred forty-seven".