2947191709557 has 4 divisors (see below), whose sum is σ = 3929588946080. Its totient is φ = 1964794473036.

The previous prime is 2947191709549. The next prime is 2947191709577. The reversal of 2947191709557 is 7559071917492.

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 not a de Polignac number, because 2947191709557 - 2³ = 2947191709549 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 (2947191709577) 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, 491198618257 + ... + 491198618262.

It is an arithmetic number, because the mean of its divisors is an integer number (982397236520).

Almost surely, 2^{2947191709557} is an apocalyptic number.

It is an amenable number.

2947191709557 is a deficient number, since it is larger than the sum of its proper divisors (982397236523).

2947191709557 is an equidigital number, since it uses as much as digits as its factorization.

2947191709557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982397236522.

The product of its (nonzero) digits is 50009400, while the sum is 66.

The spelling of 2947191709557 in words is "two trillion, nine hundred forty-seven billion, one hundred ninety-one million, seven hundred nine thousand, five hundred fifty-seven".