1216157340037 has 4 divisors (see below), whose sum is σ = 1287696007116. Its totient is φ = 1144618672960.

The previous prime is 1216157340023. The next prime is 1216157340049. The reversal of 1216157340037 is 7300437516121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1029009388801 + 187147951236 = 1014401^2 + 432606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216157340037 - 2²⁷ = 1216023122309 is a prime.

It is a super-2 number, since 2×1216157340037² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216157340017) 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, 35769333514 + ... + 35769333547.

It is an arithmetic number, because the mean of its divisors is an integer number (321924001779).

Almost surely, 2^{1216157340037} is an apocalyptic number.

1216157340037 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1216157340037 is a deficient number, since it is larger than the sum of its proper divisors (71538667079).

1216157340037 is an equidigital number, since it uses as much as digits as its factorization.

1216157340037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71538667078.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 1216157340037 in words is "one trillion, two hundred sixteen billion, one hundred fifty-seven million, three hundred forty thousand, thirty-seven".