85553986644 has 48 divisors (see below), whose sum is σ = 253493296000. Its totient is φ = 24443995968.

The previous prime is 85553986603. The next prime is 85553986649. The reversal of 85553986644 is 44668935558.

It is a happy number.

85553986644 is a `hidden beast` number, since 8 + 55 + 539 + 8 + 6 + 6 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85553986649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56582569 + ... + 56584080.

Almost surely, 2^85553986644 is an apocalyptic number.

85553986644 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

85553986644 is an abundant number, since it is smaller than the sum of its proper divisors (167939309356).

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

85553986644 is a wasteful number, since it uses less digits than its factorization.

85553986644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113166669 (or 113166661 counting only the distinct ones).

The product of its digits is 124416000, while the sum is 63.

The spelling of 85553986644 in words is "eighty-five billion, five hundred fifty-three million, nine hundred eighty-six thousand, six hundred forty-four".