1215016561201 has 4 divisors (see below), whose sum is σ = 1215018775152. Its totient is φ = 1215014347252.

The previous prime is 1215016561153. The next prime is 1215016561219. The reversal of 1215016561201 is 1021656105121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1215016561201 - 2³⁹ = 665260747313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215016561271) 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, 400686 + ... + 1609528.

It is an arithmetic number, because the mean of its divisors is an integer number (303754693788).

Almost surely, 2^{1215016561201} is an apocalyptic number.

It is an amenable number.

1215016561201 is a deficient number, since it is larger than the sum of its proper divisors (2213951).

1215016561201 is a wasteful number, since it uses less digits than its factorization.

1215016561201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213950.

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 1215016561201 in words is "one trillion, two hundred fifteen billion, sixteen million, five hundred sixty-one thousand, two hundred one".