1215561064636 has 6 divisors (see below), whose sum is σ = 2127231863120. Its totient is φ = 607780532316.

The previous prime is 1215561064621. The next prime is 1215561064651. The reversal of 1215561064636 is 6364601655121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1215561064621) and next prime (1215561064651).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151945133076 + ... + 151945133083.

Almost surely, 2^{1215561064636} is an apocalyptic number.

It is an amenable number.

1215561064636 is a deficient number, since it is larger than the sum of its proper divisors (911670798484).

1215561064636 is a wasteful number, since it uses less digits than its factorization.

1215561064636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303890266163 (or 303890266161 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 1215561064636 in words is "one trillion, two hundred fifteen billion, five hundred sixty-one million, sixty-four thousand, six hundred thirty-six".