1279823257690 has 8 divisors (see below), whose sum is σ = 2303681863860. Its totient is φ = 511929303072.

The previous prime is 1279823257651. The next prime is 1279823257733. The reversal of 1279823257690 is 967523289721.

It can be written as a sum of positive squares in 2 ways, for example, as 1059621125641 + 220202132049 = 1029379^2 + 469257^2 .

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

It is a super-2 number, since 2×1279823257690² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63991162875 + ... + 63991162894.

Almost surely, 2^{1279823257690} is an apocalyptic number.

1279823257690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1279823257690 is a deficient number, since it is larger than the sum of its proper divisors (1023858606170).

1279823257690 is a wasteful number, since it uses less digits than its factorization.

1279823257690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127982325776.

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 1279823257690 in words is "one trillion, two hundred seventy-nine billion, eight hundred twenty-three million, two hundred fifty-seven thousand, six hundred ninety".