1242279869645 has 16 divisors (see below), whose sum is σ = 1504040478192. Its totient is φ = 984955453440.

The previous prime is 1242279869641. The next prime is 1242279869647. The reversal of 1242279869645 is 5469689722421.

It can be written as a sum of positive squares in 8 ways, for example, as 4981818724 + 1237298050921 = 70582^2 + 1112339^2 .

It is not a de Polignac number, because 1242279869645 - 2² = 1242279869641 is a prime.

It is a super-3 number, since 3×1242279869645³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242279869641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8238125 + ... + 8387565.

It is an arithmetic number, because the mean of its divisors is an integer number (94002529887).

Almost surely, 2^{1242279869645} is an apocalyptic number.

It is an amenable number.

1242279869645 is a deficient number, since it is larger than the sum of its proper divisors (261760608547).

1242279869645 is a wasteful number, since it uses less digits than its factorization.

1242279869645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164272.

The product of its digits is 104509440, while the sum is 65.

The spelling of 1242279869645 in words is "one trillion, two hundred forty-two billion, two hundred seventy-nine million, eight hundred sixty-nine thousand, six hundred forty-five".