85890540561 has 16 divisors (see below), whose sum is σ = 133350274944. Its totient is φ = 48154264704.

The previous prime is 85890540559. The next prime is 85890540581. The reversal of 85890540561 is 16504509858.

It is not a de Polignac number, because 85890540561 - 2¹ = 85890540559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85890540551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38584036 + ... + 38586261.

It is an arithmetic number, because the mean of its divisors is an integer number (8334392184).

Almost surely, 2^85890540561 is an apocalyptic number.

It is an amenable number.

85890540561 is a deficient number, since it is larger than the sum of its proper divisors (47459734383).

85890540561 is a wasteful number, since it uses less digits than its factorization.

85890540561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77170360.

The product of its (nonzero) digits is 1728000, while the sum is 51.

The spelling of 85890540561 in words is "eighty-five billion, eight hundred ninety million, five hundred forty thousand, five hundred sixty-one".