1287293661612 has 72 divisors (see below), whose sum is σ = 3719888879616. Its totient is φ = 367695280224.

The previous prime is 1287293661569. The next prime is 1287293661629. The reversal of 1287293661612 is 2161663927821.

It is a happy number.

1287293661612 is a `hidden beast` number, since 1 + 2 + 8 + 7 + 2 + 9 + 3 + 6 + 616 + 12 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190063 + ... + 1615769.

It is an arithmetic number, because the mean of its divisors is an integer number (51665123328).

Almost surely, 2^{1287293661612} is an apocalyptic number.

1287293661612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1287293661612 is an abundant number, since it is smaller than the sum of its proper divisors (2432595218004).

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

1287293661612 is a wasteful number, since it uses less digits than its factorization.

1287293661612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429307 (or 1429302 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 1287293661612 in words is "one trillion, two hundred eighty-seven billion, two hundred ninety-three million, six hundred sixty-one thousand, six hundred twelve".