1215291165456 has 80 divisors (see below), whose sum is σ = 3152648485440. Its totient is φ = 403402176000.

The previous prime is 1215291165443. The next prime is 1215291165457. The reversal of 1215291165456 is 6545611925121.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1215291165457) 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, 29044006 + ... + 29085818.

It is an arithmetic number, because the mean of its divisors is an integer number (39408106068).

Almost surely, 2^{1215291165456} is an apocalyptic number.

1215291165456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1215291165456 is an abundant number, since it is smaller than the sum of its proper divisors (1937357319984).

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

1215291165456 is a wasteful number, since it uses less digits than its factorization.

1215291165456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44344 (or 44338 counting only the distinct ones).

The product of its digits is 648000, while the sum is 48.

The spelling of 1215291165456 in words is "one trillion, two hundred fifteen billion, two hundred ninety-one million, one hundred sixty-five thousand, four hundred fifty-six".