1215001671563 has 4 divisors (see below), whose sum is σ = 1226356827480. Its totient is φ = 1203646515648.

The previous prime is 1215001671557. The next prime is 1215001671601. The reversal of 1215001671563 is 3651761005121.

It is a happy number.

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 1215001671563 - 2⁸ = 1215001671307 is a prime.

It is a super-3 number, since 3×1215001671563³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215001670563) 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, 5677577798 + ... + 5677578011.

It is an arithmetic number, because the mean of its divisors is an integer number (306589206870).

Almost surely, 2^{1215001671563} is an apocalyptic number.

1215001671563 is a deficient number, since it is larger than the sum of its proper divisors (11355155917).

1215001671563 is a wasteful number, since it uses less digits than its factorization.

1215001671563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11355155916.

The product of its (nonzero) digits is 37800, while the sum is 38.

Adding to 1215001671563 its reverse (3651761005121), we get a palindrome (4866762676684).

The spelling of 1215001671563 in words is "one trillion, two hundred fifteen billion, one million, six hundred seventy-one thousand, five hundred sixty-three".