47497988861 has 4 divisors (see below), whose sum is σ = 47660098332. Its totient is φ = 47335879392.

The previous prime is 47497988803. The next prime is 47497988891. The reversal of 47497988861 is 16888979474.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16888979474 = 2 ⋅8444489737.

It can be written as a sum of positive squares in 2 ways, for example, as 23964588025 + 23533400836 = 154805^2 + 153406^2 .

It is a cyclic number.

It is not a de Polignac number, because 47497988861 - 2³⁴ = 30318119677 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 (47497988801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81054296 + ... + 81054881.

It is an arithmetic number, because the mean of its divisors is an integer number (11915024583).

Almost surely, 2^47497988861 is an apocalyptic number.

It is an amenable number.

47497988861 is a deficient number, since it is larger than the sum of its proper divisors (162109471).

47497988861 is a wasteful number, since it uses less digits than its factorization.

47497988861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162109470.

The product of its digits is 195084288, while the sum is 71.

The spelling of 47497988861 in words is "forty-seven billion, four hundred ninety-seven million, nine hundred eighty-eight thousand, eight hundred sixty-one".