1216057737640 has 16 divisors (see below), whose sum is σ = 2736129909780. Its totient is φ = 486423095040.

The previous prime is 1216057737611. The next prime is 1216057737647. The reversal of 1216057737640 is 467377506121.

It can be written as a sum of positive squares in 2 ways, for example, as 1190625780964 + 25431956676 = 1091158^2 + 159474^2 .

It is not an unprimeable number, because it can be changed into a prime (1216057737647) 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, 15200721681 + ... + 15200721760.

Almost surely, 2^{1216057737640} is an apocalyptic number.

1216057737640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216057737640 is an abundant number, since it is smaller than the sum of its proper divisors (1520072172140).

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

1216057737640 is a wasteful number, since it uses less digits than its factorization.

1216057737640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30401443452 (or 30401443448 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 49.

The spelling of 1216057737640 in words is "one trillion, two hundred sixteen billion, fifty-seven million, seven hundred thirty-seven thousand, six hundred forty".