7778890139513 has 4 divisors (see below), whose sum is σ = 7968619167348. Its totient is φ = 7589161111680.

The previous prime is 7778890139483. The next prime is 7778890139543. The reversal of 7778890139513 is 3159310988777.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (7778890139483) and next prime (7778890139543).

It can be written as a sum of positive squares in 2 ways, for example, as 429304075369 + 7349586064144 = 655213^2 + 2711012^2 .

It is a cyclic number.

It is not a de Polignac number, because 7778890139513 - 2⁸ = 7778890139257 is a prime.

It is a super-2 number, since 2×7778890139513² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7778890139543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94864513856 + ... + 94864513937.

It is an arithmetic number, because the mean of its divisors is an integer number (1992154791837).

Almost surely, 2^{7778890139513} is an apocalyptic number.

It is an amenable number.

7778890139513 is a deficient number, since it is larger than the sum of its proper divisors (189729027835).

7778890139513 is a wasteful number, since it uses less digits than its factorization.

7778890139513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189729027834.

The product of its (nonzero) digits is 80015040, while the sum is 68.

The spelling of 7778890139513 in words is "seven trillion, seven hundred seventy-eight billion, eight hundred ninety million, one hundred thirty-nine thousand, five hundred thirteen".