66070777653 has 20 divisors (see below), whose sum is σ = 98707944940. Its totient is φ = 44042890752.

The previous prime is 66070777649. The next prime is 66070777673. The reversal of 66070777653 is 35677707066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 932508369 + 65138269284 = 30537^2 + 255222^2 .

It is not a de Polignac number, because 66070777653 - 2² = 66070777649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66070777653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66070777673) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 946143 + ... + 1013571.

It is an arithmetic number, because the mean of its divisors is an integer number (4935397247).

Almost surely, 2^66070777653 is an apocalyptic number.

It is an amenable number.

66070777653 is a deficient number, since it is larger than the sum of its proper divisors (32637167287).

66070777653 is a wasteful number, since it uses less digits than its factorization.

66070777653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79538 (or 79529 counting only the distinct ones).

The product of its (nonzero) digits is 7779240, while the sum is 54.

The spelling of 66070777653 in words is "sixty-six billion, seventy million, seven hundred seventy-seven thousand, six hundred fifty-three".