85428255515 has 4 divisors (see below), whose sum is σ = 102513906624. Its totient is φ = 68342604408.

The previous prime is 85428255511. The next prime is 85428255541. The reversal of 85428255515 is 51555282458.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85428255515 - 2² = 85428255511 is a prime.

It is a super-2 number, since 2×85428255515² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85428255511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8542825547 + ... + 8542825556.

It is an arithmetic number, because the mean of its divisors is an integer number (25628476656).

Almost surely, 2^85428255515 is an apocalyptic number.

85428255515 is a deficient number, since it is larger than the sum of its proper divisors (17085651109).

85428255515 is a wasteful number, since it uses less digits than its factorization.

85428255515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17085651108.

The product of its digits is 3200000, while the sum is 50.

The spelling of 85428255515 in words is "eighty-five billion, four hundred twenty-eight million, two hundred fifty-five thousand, five hundred fifteen".