215915118061 has 2 divisors, whose sum is σ = 215915118062. Its totient is φ = 215915118060.

The previous prime is 215915118037. The next prime is 215915118137. The reversal of 215915118061 is 160811519512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194626557225 + 21288560836 = 441165^2 + 145906^2 .

It is a cyclic number.

It is not a de Polignac number, because 215915118061 - 2²¹ = 215913020909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215915118011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107957559030 + 107957559031.

It is an arithmetic number, because the mean of its divisors is an integer number (107957559031).

Almost surely, 2^215915118061 is an apocalyptic number.

It is an amenable number.

215915118061 is a deficient number, since it is larger than the sum of its proper divisors (1).

215915118061 is an equidigital number, since it uses as much as digits as its factorization.

215915118061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 40.

The spelling of 215915118061 in words is "two hundred fifteen billion, nine hundred fifteen million, one hundred eighteen thousand, sixty-one".