661267013 has 8 divisors (see below), whose sum is σ = 759349920. Its totient is φ = 569512080.

The previous prime is 661267001. The next prime is 661267109. The reversal of 661267013 is 310762166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-661267013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661267613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581770 + ... + 1582187.

It is an arithmetic number, because the mean of its divisors is an integer number (94918740).

Almost surely, 2^661267013 is an apocalyptic number.

It is an amenable number.

661267013 is a deficient number, since it is larger than the sum of its proper divisors (98082907).

661267013 is a wasteful number, since it uses less digits than its factorization.

661267013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163987.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 661267013 is about 25715.1125410720. The cubic root of 661267013 is about 871.2155523639.

The spelling of 661267013 in words is "six hundred sixty-one million, two hundred sixty-seven thousand, thirteen".