201515571651555 has 48 divisors (see below), whose sum is σ = 399992737248000. Its totient is φ = 91936792079424.

The previous prime is 201515571651553. The next prime is 201515571651601. The reversal of 201515571651555 is 555156175515102.

201515571651555 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 1 + 5 + 5 + 71 + 6 + 515 + 55 = 666.

It is not a de Polignac number, because 201515571651555 - 2¹ = 201515571651553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201515571651553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 640856817 + ... + 641171186.

It is an arithmetic number, because the mean of its divisors is an integer number (8333182026000).

Almost surely, 2^{201515571651555} is an apocalyptic number.

201515571651555 is a deficient number, since it is larger than the sum of its proper divisors (198477165596445).

201515571651555 is a wasteful number, since it uses less digits than its factorization.

201515571651555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282028520 (or 1282028517 counting only the distinct ones).

The product of its (nonzero) digits is 6562500, while the sum is 54.

The spelling of 201515571651555 in words is "two hundred one trillion, five hundred fifteen billion, five hundred seventy-one million, six hundred fifty-one thousand, five hundred fifty-five".