361518721993 has 12 divisors (see below), whose sum is σ = 427938883204. Its totient is φ = 303372352800.

The previous prime is 361518721979. The next prime is 361518721997. The reversal of 361518721993 is 399127815163.

It can be written as a sum of positive squares in 2 ways, for example, as 228404658889 + 133114063104 = 477917^2 + 364848^2 .

It is not a de Polignac number, because 361518721993 - 2⁹ = 361518721481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (361518721997) 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 11 ways as a sum of consecutive naturals, for example, 114912198 + ... + 114915343.

Almost surely, 2^361518721993 is an apocalyptic number.

It is an amenable number.

361518721993 is a deficient number, since it is larger than the sum of its proper divisors (66420161211).

361518721993 is a wasteful number, since it uses less digits than its factorization.

361518721993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229827576 (or 229827565 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 55.

The spelling of 361518721993 in words is "three hundred sixty-one billion, five hundred eighteen million, seven hundred twenty-one thousand, nine hundred ninety-three".