55787109721 has 8 divisors (see below), whose sum is σ = 64387952064. Its totient is φ = 47344081200.

The previous prime is 55787109689. The next prime is 55787109803. The reversal of 55787109721 is 12790178755.

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

It is a cyclic number.

It is not a de Polignac number, because 55787109721 - 2⁵ = 55787109689 is a prime.

It is a super-2 number, since 2×55787109721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55787104721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39452695 + ... + 39454108.

It is an arithmetic number, because the mean of its divisors is an integer number (8048494008).

Almost surely, 2^55787109721 is an apocalyptic number.

It is an amenable number.

55787109721 is a deficient number, since it is larger than the sum of its proper divisors (8600842343).

55787109721 is a wasteful number, since it uses less digits than its factorization.

55787109721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78906911.

The product of its (nonzero) digits is 1234800, while the sum is 52.

The spelling of 55787109721 in words is "fifty-five billion, seven hundred eighty-seven million, one hundred nine thousand, seven hundred twenty-one".