85663643450 has 96 divisors (see below), whose sum is σ = 210336144768. Its totient is φ = 25129728000.

The previous prime is 85663643413. The next prime is 85663643491. The reversal of 85663643450 is 5434636658.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 588971 + ... + 719870.

It is an arithmetic number, because the mean of its divisors is an integer number (2191001508).

Almost surely, 2^85663643450 is an apocalyptic number.

85663643450 is an abundant number, since it is smaller than the sum of its proper divisors (124672501318).

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

85663643450 is a wasteful number, since it uses less digits than its factorization.

85663643450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308888 (or 1308883 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 50.

The spelling of 85663643450 in words is "eighty-five billion, six hundred sixty-three million, six hundred forty-three thousand, four hundred fifty".