85025981721 has 8 divisors (see below), whose sum is σ = 113372138880. Its totient is φ = 56681906192.

The previous prime is 85025981659. The next prime is 85025981767. The reversal of 85025981721 is 12718952058.

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 85025981721 - 2¹⁴ = 85025965337 is a prime.

It is a super-2 number, since 2×85025981721² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85025988721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422466 + ... + 590363.

It is an arithmetic number, because the mean of its divisors is an integer number (14171517360).

Almost surely, 2^85025981721 is an apocalyptic number.

It is an amenable number.

85025981721 is a deficient number, since it is larger than the sum of its proper divisors (28346157159).

85025981721 is a wasteful number, since it uses less digits than its factorization.

85025981721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040815.

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 85025981721 in words is "eighty-five billion, twenty-five million, nine hundred eighty-one thousand, seven hundred twenty-one".