55056015661 has 4 divisors (see below), whose sum is σ = 55100814300. Its totient is φ = 55011217024.

The previous prime is 55056015647. The next prime is 55056015667. The reversal of 55056015661 is 16651065055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48951562500 + 6104453161 = 221250^2 + 78131^2 .

It is a cyclic number.

It is not a de Polignac number, because 55056015661 - 2⁵ = 55056015629 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 (55056015667) 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, 22397476 + ... + 22399933.

It is an arithmetic number, because the mean of its divisors is an integer number (13775203575).

Almost surely, 2^55056015661 is an apocalyptic number.

It is an amenable number.

55056015661 is a deficient number, since it is larger than the sum of its proper divisors (44798639).

55056015661 is a wasteful number, since it uses less digits than its factorization.

55056015661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44798638.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 55056015661 in words is "fifty-five billion, fifty-six million, fifteen thousand, six hundred sixty-one".