661319397182 has 8 divisors (see below), whose sum is σ = 997118884416. Its totient is φ = 328946435712.

The previous prime is 661319397161. The next prime is 661319397191. The reversal of 661319397182 is 281793913166.

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

It is a super-2 number, since 2×661319397182² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856630958 + ... + 856631729.

It is an arithmetic number, because the mean of its divisors is an integer number (124639860552).

Almost surely, 2^661319397182 is an apocalyptic number.

661319397182 is a deficient number, since it is larger than the sum of its proper divisors (335799487234).

661319397182 is a wasteful number, since it uses less digits than its factorization.

661319397182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713262882.

The product of its digits is 2939328, while the sum is 56.

It can be divided in two parts, 661319 and 397182, that added together give a palindrome (1058501).

The spelling of 661319397182 in words is "six hundred sixty-one billion, three hundred nineteen million, three hundred ninety-seven thousand, one hundred eighty-two".