55000005661 has 8 divisors (see below), whose sum is σ = 56780352000. Its totient is φ = 53220043920.

The previous prime is 55000005653. The next prime is 55000005703. The reversal of 55000005661 is 16650000055.

55000005661 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 a cyclic number.

It is not a de Polignac number, because 55000005661 - 2³ = 55000005653 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 (55009005661) 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, 210015 + ... + 392563.

It is an arithmetic number, because the mean of its divisors is an integer number (7097544000).

Almost surely, 2^55000005661 is an apocalyptic number.

It is an amenable number.

55000005661 is a deficient number, since it is larger than the sum of its proper divisors (1780346339).

55000005661 is a wasteful number, since it uses less digits than its factorization.

55000005661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192299.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 55000005661 in words is "fifty-five billion, five thousand, six hundred sixty-one".