66020522550 has 48 divisors (see below), whose sum is σ = 173362131792. Its totient is φ = 16569856000.

The previous prime is 66020522537. The next prime is 66020522629. The reversal of 66020522550 is 5522502066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12942651 + ... + 12947750.

It is an arithmetic number, because the mean of its divisors is an integer number (3611711079).

Almost surely, 2^66020522550 is an apocalyptic number.

66020522550 is an abundant number, since it is smaller than the sum of its proper divisors (107341609242).

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

66020522550 is a wasteful number, since it uses less digits than its factorization.

66020522550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25890433 (or 25890428 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 66020522550 in words is "sixty-six billion, twenty million, five hundred twenty-two thousand, five hundred fifty".