85545512640 has 280 divisors, whose sum is σ = 347772666912. Its totient is φ = 19553218560.

The previous prime is 85545512629. The next prime is 85545512687. The reversal of 85545512640 is 4621554558.

85545512640 is a `hidden beast` number, since 8 + 5 + 54 + 551 + 2 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54301 + ... + 417180.

Almost surely, 2^85545512640 is an apocalyptic number.

85545512640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85545512640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173886333456).

85545512640 is an abundant number, since it is smaller than the sum of its proper divisors (262227154272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85545512640 is a wasteful number, since it uses less digits than its factorization.

85545512640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471517 (or 471498 counting only the distinct ones).

The product of its (nonzero) digits is 960000, while the sum is 45.

The spelling of 85545512640 in words is "eighty-five billion, five hundred forty-five million, five hundred twelve thousand, six hundred forty".