201512261663511 has 4 divisors (see below), whose sum is σ = 268683015551352. Its totient is φ = 134341507775672.

The previous prime is 201512261663491. The next prime is 201512261663639. The reversal of 201512261663511 is 115366162215102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201512261663511 - 2¹⁰ = 201512261662487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201512261662511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33585376943916 + ... + 33585376943921.

It is an arithmetic number, because the mean of its divisors is an integer number (67170753887838).

Almost surely, 2^{201512261663511} is an apocalyptic number.

201512261663511 is a deficient number, since it is larger than the sum of its proper divisors (67170753887841).

201512261663511 is an equidigital number, since it uses as much as digits as its factorization.

201512261663511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67170753887840.

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 201512261663511 in words is "two hundred one trillion, five hundred twelve billion, two hundred sixty-one million, six hundred sixty-three thousand, five hundred eleven".