201551305415555 has 16 divisors (see below), whose sum is σ = 249671643141888. Its totient is φ = 156034663680000.

The previous prime is 201551305415543. The next prime is 201551305415723. The reversal of 201551305415555 is 555514503155102.

It is not a de Polignac number, because 201551305415555 - 2⁴ = 201551305415539 is a prime.

It is a Duffinian number.

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, 16267346 + ... + 25840455.

It is an arithmetic number, because the mean of its divisors is an integer number (15604477696368).

Almost surely, 2^{201551305415555} is an apocalyptic number.

201551305415555 is a deficient number, since it is larger than the sum of its proper divisors (48120337726333).

201551305415555 is a wasteful number, since it uses less digits than its factorization.

201551305415555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42138718.

The product of its (nonzero) digits is 1875000, while the sum is 47.

The spelling of 201551305415555 in words is "two hundred one trillion, five hundred fifty-one billion, three hundred five million, four hundred fifteen thousand, five hundred fifty-five".