1215972651579 has 16 divisors (see below), whose sum is σ = 1852970265600. Its totient is φ = 694819180800.

The previous prime is 1215972651563. The next prime is 1215972651589. The reversal of 1215972651579 is 9751562795121.

It is not a de Polignac number, because 1215972651579 - 2⁴ = 1215972651563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215972651589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250147 + ... + 1579404.

It is an arithmetic number, because the mean of its divisors is an integer number (115810641600).

Almost surely, 2^{1215972651579} is an apocalyptic number.

1215972651579 is a deficient number, since it is larger than the sum of its proper divisors (636997614021).

1215972651579 is a wasteful number, since it uses less digits than its factorization.

1215972651579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861210.

The product of its digits is 11907000, while the sum is 60.

The spelling of 1215972651579 in words is "one trillion, two hundred fifteen billion, nine hundred seventy-two million, six hundred fifty-one thousand, five hundred seventy-nine".