1290078679681 has 16 divisors (see below), whose sum is σ = 1416933036288. Its totient is φ = 1164847078800.

The previous prime is 1290078679597. The next prime is 1290078679693. The reversal of 1290078679681 is 1869768700921.

It is a cyclic number.

It is not a de Polignac number, because 1290078679681 - 2¹³ = 1290078671489 is a prime.

It is a super-2 number, since 2×1290078679681² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1290078670681) 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, 280746 + ... + 1630636.

It is an arithmetic number, because the mean of its divisors is an integer number (88558314768).

Almost surely, 2^{1290078679681} is an apocalyptic number.

1290078679681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1290078679681 is a deficient number, since it is larger than the sum of its proper divisors (126854356607).

1290078679681 is a wasteful number, since it uses less digits than its factorization.

1290078679681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350492.

The product of its (nonzero) digits is 18289152, while the sum is 64.

The spelling of 1290078679681 in words is "one trillion, two hundred ninety billion, seventy-eight million, six hundred seventy-nine thousand, six hundred eighty-one".