1242663432551 has 8 divisors (see below), whose sum is σ = 1253857404240. Its totient is φ = 1231472916352.

The previous prime is 1242663432529. The next prime is 1242663432553. The reversal of 1242663432551 is 1552343662421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242663432551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242663432553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138665 + ... + 1582578.

It is an arithmetic number, because the mean of its divisors is an integer number (156732175530).

Almost surely, 2^{1242663432551} is an apocalyptic number.

1242663432551 is a deficient number, since it is larger than the sum of its proper divisors (11193971689).

1242663432551 is a wasteful number, since it uses less digits than its factorization.

1242663432551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727745.

The product of its digits is 1036800, while the sum is 44.

The spelling of 1242663432551 in words is "one trillion, two hundred forty-two billion, six hundred sixty-three million, four hundred thirty-two thousand, five hundred fifty-one".