201534027978 has 16 divisors (see below), whose sum is σ = 403109815680. Its totient is φ = 67171049376.

The previous prime is 201534027941. The next prime is 201534027983. The reversal of 201534027978 is 879720435102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1677075 + ... + 1793222.

It is an arithmetic number, because the mean of its divisors is an integer number (25194363480).

Almost surely, 2^201534027978 is an apocalyptic number.

201534027978 is an abundant number, since it is smaller than the sum of its proper divisors (201575787702).

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

201534027978 is a wasteful number, since it uses less digits than its factorization.

201534027978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479981.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 201534027978 in words is "two hundred one billion, five hundred thirty-four million, twenty-seven thousand, nine hundred seventy-eight".