201181781398 has 32 divisors (see below), whose sum is σ = 333864800640. Its totient is φ = 90877438080.

The previous prime is 201181781393. The next prime is 201181781419. The reversal of 201181781398 is 893187181102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201181781393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280563 + ... + 693598.

It is an arithmetic number, because the mean of its divisors is an integer number (10433275020).

Almost surely, 2^201181781398 is an apocalyptic number.

201181781398 is a deficient number, since it is larger than the sum of its proper divisors (132683019242).

201181781398 is an equidigital number, since it uses as much as digits as its factorization.

201181781398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974249 (or 974223 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 49.

The spelling of 201181781398 in words is "two hundred one billion, one hundred eighty-one million, seven hundred eighty-one thousand, three hundred ninety-eight".