161205101202050 has 12 divisors (see below), whose sum is σ = 299841488235906. Its totient is φ = 64482040480800.

The previous prime is 161205101202049. The next prime is 161205101202059. The reversal of 161205101202050 is 50202101502161.

It can be written as a sum of positive squares in 3 ways, for example, as 120351233961841 + 40853867240209 = 10970471^2 + 6391703^2 .

It is not an unprimeable number, because it can be changed into a prime (161205101202059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1612051011971 + ... + 1612051012070.

Almost surely, 2^{161205101202050} is an apocalyptic number.

161205101202050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161205101202050 is a deficient number, since it is larger than the sum of its proper divisors (138636387033856).

161205101202050 is a wasteful number, since it uses less digits than its factorization.

161205101202050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224102024053 (or 3224102024048 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 161205101202050 in words is "one hundred sixty-one trillion, two hundred five billion, one hundred one million, two hundred two thousand, fifty".