215015542461 has 6 divisors (see below), whose sum is σ = 310578005790. Its totient is φ = 143343694968.

The previous prime is 215015542459. The next prime is 215015542493. The reversal of 215015542461 is 164245510512.

215015542461 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 155 + 42 + 461 = 666.

It can be written as a sum of positive squares in only one way, i.e., 114078440025 + 100937102436 = 337755^2 + 317706^2 .

It is not a de Polignac number, because 215015542461 - 2¹ = 215015542459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215015542661) 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 5 ways as a sum of consecutive naturals, for example, 11945307906 + ... + 11945307923.

It is an arithmetic number, because the mean of its divisors is an integer number (51763000965).

Almost surely, 2^215015542461 is an apocalyptic number.

It is an amenable number.

215015542461 is a deficient number, since it is larger than the sum of its proper divisors (95562463329).

215015542461 is a wasteful number, since it uses less digits than its factorization.

215015542461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23890615835 (or 23890615832 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 215015542461 in words is "two hundred fifteen billion, fifteen million, five hundred forty-two thousand, four hundred sixty-one".