47640738637 has 2 divisors, whose sum is σ = 47640738638. Its totient is φ = 47640738636.

The previous prime is 47640738631. The next prime is 47640738709. The reversal of 47640738637 is 73683704674.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39063941316 + 8576797321 = 197646^2 + 92611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47640738637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47640738631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23820369318 + 23820369319.

It is an arithmetic number, because the mean of its divisors is an integer number (23820369319).

Almost surely, 2^47640738637 is an apocalyptic number.

It is an amenable number.

47640738637 is a deficient number, since it is larger than the sum of its proper divisors (1).

47640738637 is an equidigital number, since it uses as much as digits as its factorization.

47640738637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 55.

The spelling of 47640738637 in words is "forty-seven billion, six hundred forty million, seven hundred thirty-eight thousand, six hundred thirty-seven".