1279948243561 has 8 divisors (see below), whose sum is σ = 1378433323904. Its totient is φ = 1181467095120.

The previous prime is 1279948243547. The next prime is 1279948243577. The reversal of 1279948243561 is 1653428499721.

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

It is not a de Polignac number, because 1279948243561 - 2⁵ = 1279948243529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1279948243561.

It is not an unprimeable number, because it can be changed into a prime (1279948273561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288705 + ... + 1625806.

It is an arithmetic number, because the mean of its divisors is an integer number (172304165488).

Almost surely, 2^{1279948243561} is an apocalyptic number.

It is an amenable number.

1279948243561 is a deficient number, since it is larger than the sum of its proper divisors (98485080343).

1279948243561 is a wasteful number, since it uses less digits than its factorization.

1279948243561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965951.

The product of its digits is 26127360, while the sum is 61.

The spelling of 1279948243561 in words is "one trillion, two hundred seventy-nine billion, nine hundred forty-eight million, two hundred forty-three thousand, five hundred sixty-one".