53722588666 has 4 divisors (see below), whose sum is σ = 80583883002. Its totient is φ = 26861294332.

The previous prime is 53722588663. The next prime is 53722588687. The reversal of 53722588666 is 66688522735.

53722588666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47445988041 + 6276600625 = 217821^2 + 79225^2 .

It is a super-2 number, since 2×53722588666² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 53722588666.

It is not an unprimeable number, because it can be changed into a prime (53722588663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13430647165 + ... + 13430647168.

Almost surely, 2^53722588666 is an apocalyptic number.

53722588666 is a deficient number, since it is larger than the sum of its proper divisors (26861294336).

53722588666 is a wasteful number, since it uses less digits than its factorization.

53722588666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26861294335.

The product of its digits is 29030400, while the sum is 58.

The spelling of 53722588666 in words is "fifty-three billion, seven hundred twenty-two million, five hundred eighty-eight thousand, six hundred sixty-six".