669554455966 has 16 divisors (see below), whose sum is σ = 1095867698688. Its totient is φ = 304278175000.

The previous prime is 669554455903. The next prime is 669554455991.

669554455966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669554455895 and 669554455904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3132160 + ... + 3339091.

It is an arithmetic number, because the mean of its divisors is an integer number (68491731168).

Almost surely, 2^669554455966 is an apocalyptic number.

669554455966 is a deficient number, since it is larger than the sum of its proper divisors (426313242722).

669554455966 is a wasteful number, since it uses less digits than its factorization.

669554455966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475967.

The product of its digits is 1049760000, while the sum is 70.

The spelling of 669554455966 in words is "six hundred sixty-nine billion, five hundred fifty-four million, four hundred fifty-five thousand, nine hundred sixty-six".