201581261854 has 16 divisors (see below), whose sum is σ = 347687929728. Its totient is φ = 85861956312.

The previous prime is 201581261831. The next prime is 201581261857. The reversal of 201581261854 is 458162185102.

It is a self number, because there is not a number n which added to its sum of digits gives 201581261854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201581261857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44165392 + ... + 44169955.

It is an arithmetic number, because the mean of its divisors is an integer number (21730495608).

Almost surely, 2^201581261854 is an apocalyptic number.

201581261854 is a deficient number, since it is larger than the sum of its proper divisors (146106667874).

201581261854 is a wasteful number, since it uses less digits than its factorization.

201581261854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88335519.

The product of its (nonzero) digits is 153600, while the sum is 43.

The spelling of 201581261854 in words is "two hundred one billion, five hundred eighty-one million, two hundred sixty-one thousand, eight hundred fifty-four".