66502050661 has 16 divisors (see below), whose sum is σ = 73508774400. Its totient is φ = 59841669888.

The previous prime is 66502050623. The next prime is 66502050673. The reversal of 66502050661 is 16605020566.

It is a cyclic number.

It is not a de Polignac number, because 66502050661 - 2³³ = 57912116069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66502050661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66502050161) 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, 849700 + ... + 924658.

It is an arithmetic number, because the mean of its divisors is an integer number (4594298400).

Almost surely, 2^66502050661 is an apocalyptic number.

It is an amenable number.

66502050661 is a deficient number, since it is larger than the sum of its proper divisors (7006723739).

66502050661 is a wasteful number, since it uses less digits than its factorization.

66502050661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77268.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 66502050661 in words is "sixty-six billion, five hundred two million, fifty thousand, six hundred sixty-one".