201261242178 has 12 divisors (see below), whose sum is σ = 436066024758. Its totient is φ = 67087080720.

The previous prime is 201261242167. The next prime is 201261242191. The reversal of 201261242178 is 871242162102.

201261242178 is a `hidden beast` number, since 2 + 0 + 12 + 612 + 4 + 21 + 7 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 146377403649 + 54883838529 = 382593^2 + 234273^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5590590043 + ... + 5590590078.

Almost surely, 2^201261242178 is an apocalyptic number.

201261242178 is an abundant number, since it is smaller than the sum of its proper divisors (234804782580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201261242178 is a wasteful number, since it uses less digits than its factorization.

201261242178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11181180129 (or 11181180126 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 201261242178 in words is "two hundred one billion, two hundred sixty-one million, two hundred forty-two thousand, one hundred seventy-eight".