661366447014 has 64 divisors (see below), whose sum is σ = 1631465611776. Its totient is φ = 174052744704.

The previous prime is 661366447009. The next prime is 661366447019. The reversal of 661366447014 is 410744663166.

It is an interprime number because it is at equal distance from previous prime (661366447009) and next prime (661366447019).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661366447019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1041907 + ... + 1551870.

It is an arithmetic number, because the mean of its divisors is an integer number (25491650184).

Almost surely, 2^661366447014 is an apocalyptic number.

661366447014 is an abundant number, since it is smaller than the sum of its proper divisors (970099164762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661366447014 is a wasteful number, since it uses less digits than its factorization.

661366447014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594269.

The product of its (nonzero) digits is 1741824, while the sum is 48.

The spelling of 661366447014 in words is "six hundred sixty-one billion, three hundred sixty-six million, four hundred forty-seven thousand, fourteen".