85721500015 has 8 divisors (see below), whose sum is σ = 103404365568. Its totient is φ = 68218156320.

The previous prime is 85721499977. The next prime is 85721500057. The reversal of 85721500015 is 51000512758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85721500015 - 2¹⁹ = 85720975727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44879412 + ... + 44881321.

It is an arithmetic number, because the mean of its divisors is an integer number (12925545696).

Almost surely, 2^85721500015 is an apocalyptic number.

85721500015 is a deficient number, since it is larger than the sum of its proper divisors (17682865553).

85721500015 is a wasteful number, since it uses less digits than its factorization.

85721500015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89760929.

The product of its (nonzero) digits is 14000, while the sum is 34.

The spelling of 85721500015 in words is "eighty-five billion, seven hundred twenty-one million, five hundred thousand, fifteen".