121581547647 has 8 divisors (see below), whose sum is σ = 185267120256. Its totient is φ = 69475170072.

The previous prime is 121581547613. The next prime is 121581547651. The reversal of 121581547647 is 746745185121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121581547647 - 2⁷ = 121581547519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121581547647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121581547697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2894798733 + ... + 2894798774.

It is an arithmetic number, because the mean of its divisors is an integer number (23158390032).

Almost surely, 2^121581547647 is an apocalyptic number.

121581547647 is a deficient number, since it is larger than the sum of its proper divisors (63685572609).

121581547647 is an equidigital number, since it uses as much as digits as its factorization.

121581547647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5789597517.

The product of its digits is 1881600, while the sum is 51.

The spelling of 121581547647 in words is "one hundred twenty-one billion, five hundred eighty-one million, five hundred forty-seven thousand, six hundred forty-seven".