661326116503465 has 16 divisors (see below), whose sum is σ = 907347965715072. Its totient is φ = 453287548347264.

The previous prime is 661326116503397. The next prime is 661326116503483. The reversal of 661326116503465 is 564305611623166.

It is a cyclic number.

It is not a de Polignac number, because 661326116503465 - 2⁷ = 661326116503337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4025276164 + ... + 4025440453.

It is an arithmetic number, because the mean of its divisors is an integer number (56709247857192).

Almost surely, 2^{661326116503465} is an apocalyptic number.

It is an amenable number.

661326116503465 is a deficient number, since it is larger than the sum of its proper divisors (246021849211607).

661326116503465 is a wasteful number, since it uses less digits than its factorization.

661326116503465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8050718976.

The product of its (nonzero) digits is 13996800, while the sum is 55.

The spelling of 661326116503465 in words is "six hundred sixty-one trillion, three hundred twenty-six billion, one hundred sixteen million, five hundred three thousand, four hundred sixty-five".