201278134578 has 32 divisors (see below), whose sum is σ = 407469295296. Its totient is φ = 66274123968.

The previous prime is 201278134529. The next prime is 201278134583. The reversal of 201278134578 is 875431872102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3624276 + ... + 3679392.

It is an arithmetic number, because the mean of its divisors is an integer number (12733415478).

Almost surely, 2^201278134578 is an apocalyptic number.

201278134578 is an abundant number, since it is smaller than the sum of its proper divisors (206191160718).

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

201278134578 is a wasteful number, since it uses less digits than its factorization.

201278134578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62538.

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 201278134578 in words is "two hundred one billion, two hundred seventy-eight million, one hundred thirty-four thousand, five hundred seventy-eight".