201551515505 has 16 divisors (see below), whose sum is σ = 246091726800. Its totient is φ = 158426972160.

The previous prime is 201551515493. The next prime is 201551515513. The reversal of 201551515505 is 505515155102.

It can be written as a sum of positive squares in 8 ways, for example, as 140961200704 + 60590314801 = 375448^2 + 246151^2 .

It is not a de Polignac number, because 201551515505 - 2¹⁰ = 201551514481 is a prime.

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, 72320 + ... + 639009.

It is an arithmetic number, because the mean of its divisors is an integer number (15380732925).

Almost surely, 2^201551515505 is an apocalyptic number.

It is an amenable number.

201551515505 is a deficient number, since it is larger than the sum of its proper divisors (44540211295).

201551515505 is an equidigital number, since it uses as much as digits as its factorization.

201551515505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712324.

The product of its (nonzero) digits is 31250, while the sum is 35.

The spelling of 201551515505 in words is "two hundred one billion, five hundred fifty-one million, five hundred fifteen thousand, five hundred five".