1212513111660 has 48 divisors (see below), whose sum is σ = 3442854143232. Its totient is φ = 318782788800.

The previous prime is 1212513111647. The next prime is 1212513111701. The reversal of 1212513111660 is 661113152121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142309486 + ... + 142318005.

It is an arithmetic number, because the mean of its divisors is an integer number (71726127984).

Almost surely, 2^{1212513111660} is an apocalyptic number.

1212513111660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212513111660 is an abundant number, since it is smaller than the sum of its proper divisors (2230341031572).

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

1212513111660 is a wasteful number, since it uses less digits than its factorization.

1212513111660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284627574 (or 284627572 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

Adding to 1212513111660 its reverse (661113152121), we get a palindrome (1873626263781).

The spelling of 1212513111660 in words is "one trillion, two hundred twelve billion, five hundred thirteen million, one hundred eleven thousand, six hundred sixty".