661682577459 has 16 divisors (see below), whose sum is σ = 890546707872. Its totient is φ = 436988494848.

The previous prime is 661682577427. The next prime is 661682577497. The reversal of 661682577459 is 954775286166.

It is not a de Polignac number, because 661682577459 - 2⁵ = 661682577427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661682577459.

It is not an unprimeable number, because it can be changed into a prime (661682577499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2157534 + ... + 2445059.

It is an arithmetic number, because the mean of its divisors is an integer number (55659169242).

Almost surely, 2^661682577459 is an apocalyptic number.

661682577459 is a deficient number, since it is larger than the sum of its proper divisors (228864130413).

661682577459 is a wasteful number, since it uses less digits than its factorization.

661682577459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4603046.

The product of its digits is 152409600, while the sum is 66.

The spelling of 661682577459 in words is "six hundred sixty-one billion, six hundred eighty-two million, five hundred seventy-seven thousand, four hundred fifty-nine".