47381981669 has 4 divisors (see below), whose sum is σ = 51689434560. Its totient is φ = 43074528780.

The previous prime is 47381981641. The next prime is 47381981677. The reversal of 47381981669 is 96618918374.

47381981669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47381981669 is a prime.

It is a super-2 number, since 2×47381981669² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47381981369) 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, 2153726429 + ... + 2153726450.

It is an arithmetic number, because the mean of its divisors is an integer number (12922358640).

Almost surely, 2^47381981669 is an apocalyptic number.

It is an amenable number.

47381981669 is a deficient number, since it is larger than the sum of its proper divisors (4307452891).

47381981669 is a wasteful number, since it uses less digits than its factorization.

47381981669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307452890.

The product of its digits is 15676416, while the sum is 62.

The spelling of 47381981669 in words is "forty-seven billion, three hundred eighty-one million, nine hundred eighty-one thousand, six hundred sixty-nine".