1215667220329 has 9 divisors (see below), whose sum is σ = 1242135754237. Its totient is φ = 1189751241964.

The previous prime is 1215667220297. The next prime is 1215667220353. The reversal of 1215667220329 is 9230227665121.

The square root of 1215667220329 is 1102573.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1215667220329 - 2⁵ = 1215667220297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215667220359) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 51809202 + ... + 51832660.

Almost surely, 2^{1215667220329} is an apocalyptic number.

1215667220329 is the 1102573-rd square number.

1215667220329 is the 551287-th centered octagonal number.

It is an amenable number.

1215667220329 is a deficient number, since it is larger than the sum of its proper divisors (26468533908).

1215667220329 is an frugal number, since it uses more digits than its factorization.

1215667220329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47012 (or 23506 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 1215667220329 in words is "one trillion, two hundred fifteen billion, six hundred sixty-seven million, two hundred twenty thousand, three hundred twenty-nine".