55066150015561 has 4 divisors (see below), whose sum is σ = 58305335310612. Its totient is φ = 51826964720512.

The previous prime is 55066150015543. The next prime is 55066150015579. The reversal of 55066150015561 is 16551005166055.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (55066150015543) and next prime (55066150015579).

It can be written as a sum of positive squares in 2 ways, for example, as 21699572558400 + 33366577457161 = 4658280^2 + 5776381^2 .

It is a cyclic number.

It is not a de Polignac number, because 55066150015561 - 2⁷ = 55066150015433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55066150015061) 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, 1619592647500 + ... + 1619592647533.

It is an arithmetic number, because the mean of its divisors is an integer number (14576333827653).

Almost surely, 2^{55066150015561} is an apocalyptic number.

It is an amenable number.

55066150015561 is a deficient number, since it is larger than the sum of its proper divisors (3239185295051).

55066150015561 is a wasteful number, since it uses less digits than its factorization.

55066150015561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239185295050.

The product of its (nonzero) digits is 675000, while the sum is 46.

The spelling of 55066150015561 in words is "fifty-five trillion, sixty-six billion, one hundred fifty million, fifteen thousand, five hundred sixty-one".