1215717261948 has 54 divisors (see below), whose sum is σ = 3512122655496. Its totient is φ = 347342788224.

The previous prime is 1215717261937. The next prime is 1215717261971. The reversal of 1215717261948 is 8491627175121.

1215717261948 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 7 + 17 + 2 + 619 + 4 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1215717261894 and 1215717261903.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17468436 + ... + 17537892.

Almost surely, 2^{1215717261948} is an apocalyptic number.

1215717261948 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1215717261948 is an abundant number, since it is smaller than the sum of its proper divisors (2296405393548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215717261948 is an frugal number, since it uses more digits than its factorization.

1215717261948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138931 (or 69469 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The spelling of 1215717261948 in words is "one trillion, two hundred fifteen billion, seven hundred seventeen million, two hundred sixty-one thousand, nine hundred forty-eight".