1216508253513 has 16 divisors (see below), whose sum is σ = 1854906878976. Its totient is φ = 694705067280.

The previous prime is 1216508253491. The next prime is 1216508253517. The reversal of 1216508253513 is 3153528056121.

It is not a de Polignac number, because 1216508253513 - 2¹² = 1216508249417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216508253517) 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, 18403981 + ... + 18469962.

It is an arithmetic number, because the mean of its divisors is an integer number (115931679936).

Almost surely, 2^{1216508253513} is an apocalyptic number.

It is an amenable number.

1216508253513 is a deficient number, since it is larger than the sum of its proper divisors (638398625463).

1216508253513 is a wasteful number, since it uses less digits than its factorization.

1216508253513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36875524.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 1216508253513 in words is "one trillion, two hundred sixteen billion, five hundred eight million, two hundred fifty-three thousand, five hundred thirteen".