666350525053666 has 16 divisors (see below), whose sum is σ = 1000708719192000. Its totient is φ = 332781081007408.

The previous prime is 666350525053637. The next prime is 666350525053669.

It is a happy number.

666350525053666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666350525053598 and 666350525053607.

It is not an unprimeable number, because it can be changed into a prime (666350525053669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21920806 + ... + 42581953.

It is an arithmetic number, because the mean of its divisors is an integer number (62544294949500).

Almost surely, 2^{666350525053666} is an apocalyptic number.

666350525053666 is a deficient number, since it is larger than the sum of its proper divisors (334358194138334).

666350525053666 is a wasteful number, since it uses less digits than its factorization.

666350525053666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64508873.

The product of its (nonzero) digits is 524880000, while the sum is 64.

The spelling of 666350525053666 in words is "six hundred sixty-six trillion, three hundred fifty billion, five hundred twenty-five million, fifty-three thousand, six hundred sixty-six".