561166015070021 has 8 divisors (see below), whose sum is σ = 561425365635288. Its totient is φ = 560906670528000.

The previous prime is 561166015069973. The next prime is 561166015070029. The reversal of 561166015070021 is 120070510661165.

It can be written as a sum of positive squares in 4 ways, for example, as 208993688344996 + 352172326725025 = 14456614^2 + 18766255^2 .

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 561166015070021 - 2⁴² = 556767968558917 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 (561166015070029) 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, 190523981 + ... + 193446941.

It is an arithmetic number, because the mean of its divisors is an integer number (70178170704411).

Almost surely, 2^{561166015070021} is an apocalyptic number.

It is an amenable number.

561166015070021 is a deficient number, since it is larger than the sum of its proper divisors (259350565267).

561166015070021 is a wasteful number, since it uses less digits than its factorization.

561166015070021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011623.

The product of its (nonzero) digits is 75600, while the sum is 41.

The spelling of 561166015070021 in words is "five hundred sixty-one trillion, one hundred sixty-six billion, fifteen million, seventy thousand, twenty-one".