212566064261 has 8 divisors (see below), whose sum is σ = 225083942424. Its totient is φ = 200049740800.

The previous prime is 212566064177. The next prime is 212566064281. The reversal of 212566064261 is 162460665212.

It can be written as a sum of positive squares in 4 ways, for example, as 121727721025 + 90838343236 = 348895^2 + 301394^2 .

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 212566064261 - 2³⁴ = 195386195077 is a prime.

It is a super-2 number, since 2×212566064261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212566064281) 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, 101090 + ... + 659811.

It is an arithmetic number, because the mean of its divisors is an integer number (28135492803).

Almost surely, 2^212566064261 is an apocalyptic number.

It is an amenable number.

212566064261 is a deficient number, since it is larger than the sum of its proper divisors (12517878163).

212566064261 is a wasteful number, since it uses less digits than its factorization.

212566064261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777351.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 212566064261 in words is "two hundred twelve billion, five hundred sixty-six million, sixty-four thousand, two hundred sixty-one".