211455261406561 has 8 divisors (see below), whose sum is σ = 213779654201664. Its totient is φ = 209137316304240.

The previous prime is 211455261406547. The next prime is 211455261406579. The reversal of 211455261406561 is 165604162554112.

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 211455261406561 - 2³⁹ = 210905505592673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211455261406261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1611857245 + ... + 1611988426.

It is an arithmetic number, because the mean of its divisors is an integer number (26722456775208).

Almost surely, 2^{211455261406561} is an apocalyptic number.

It is an amenable number.

211455261406561 is a deficient number, since it is larger than the sum of its proper divisors (2324392795103).

211455261406561 is a wasteful number, since it uses less digits than its factorization.

211455261406561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223846391.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 211455261406561 in words is "two hundred eleven trillion, four hundred fifty-five billion, two hundred sixty-one million, four hundred six thousand, five hundred sixty-one".