66862136550 has 96 divisors (see below), whose sum is σ = 184741461504. Its totient is φ = 15864112000.

The previous prime is 66862136533. The next prime is 66862136557. The reversal of 66862136550 is 5563126866.

It is a self number, because there is not a number n which added to its sum of digits gives 66862136550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66862136557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 353541 + ... + 508640.

It is an arithmetic number, because the mean of its divisors is an integer number (1924390224).

Almost surely, 2^66862136550 is an apocalyptic number.

66862136550 is an abundant number, since it is smaller than the sum of its proper divisors (117879324954).

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

66862136550 is a wasteful number, since it uses less digits than its factorization.

66862136550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862254 (or 862249 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 66862136550 in words is "sixty-six billion, eight hundred sixty-two million, one hundred thirty-six thousand, five hundred fifty".