55707077721 has 8 divisors (see below), whose sum is σ = 78185372320. Its totient is φ = 35183417472.

The previous prime is 55707077693. The next prime is 55707077737. The reversal of 55707077721 is 12777070755.

55707077721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 55707077721 - 2³¹ = 53559594073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55707077821) 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, 488658520 + ... + 488658633.

It is an arithmetic number, because the mean of its divisors is an integer number (9773171540).

Almost surely, 2^55707077721 is an apocalyptic number.

It is an amenable number.

55707077721 is a deficient number, since it is larger than the sum of its proper divisors (22478294599).

55707077721 is a wasteful number, since it uses less digits than its factorization.

55707077721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977317175.

The product of its (nonzero) digits is 840350, while the sum is 48.

The spelling of 55707077721 in words is "fifty-five billion, seven hundred seven million, seventy-seven thousand, seven hundred twenty-one".