161635381416650 has 24 divisors (see below), whose sum is σ = 301232461367340. Its totient is φ = 64527130645760.

The previous prime is 161635381416617. The next prime is 161635381416709. The reversal of 161635381416650 is 56614183536161.

It can be written as a sum of positive squares in 6 ways, for example, as 135523148556481 + 26112232860169 = 11641441^2 + 5110013^2 .

It is a super-2 number, since 2×161635381416650² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3175522319 + ... + 3175573218.

Almost surely, 2^{161635381416650} is an apocalyptic number.

161635381416650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161635381416650 is a deficient number, since it is larger than the sum of its proper divisors (139597079950690).

161635381416650 is a wasteful number, since it uses less digits than its factorization.

161635381416650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351096058 (or 6351096053 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 161635381416650 in words is "one hundred sixty-one trillion, six hundred thirty-five billion, three hundred eighty-one million, four hundred sixteen thousand, six hundred fifty".