47648761561 has 4 divisors (see below), whose sum is σ = 48547794852. Its totient is φ = 46749728272.

The previous prime is 47648761471. The next prime is 47648761591. The reversal of 47648761561 is 16516784674.

It is a happy number.

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 36313113600 + 11335647961 = 190560^2 + 106469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47648761561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47648761591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449516566 + ... + 449516671.

It is an arithmetic number, because the mean of its divisors is an integer number (12136948713).

Almost surely, 2^47648761561 is an apocalyptic number.

It is an amenable number.

47648761561 is a deficient number, since it is larger than the sum of its proper divisors (899033291).

47648761561 is an equidigital number, since it uses as much as digits as its factorization.

47648761561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899033290.

The product of its digits is 6773760, while the sum is 55.

The spelling of 47648761561 in words is "forty-seven billion, six hundred forty-eight million, seven hundred sixty-one thousand, five hundred sixty-one".