2638378585078 has 4 divisors (see below), whose sum is σ = 3957567877620. Its totient is φ = 1319189292538.

The previous prime is 2638378585061. The next prime is 2638378585091. The reversal of 2638378585078 is 8705858738362.

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

It is a super-2 number, since 2×2638378585078² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2638378584998 and 2638378585016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659594646268 + ... + 659594646271.

It is an arithmetic number, because the mean of its divisors is an integer number (989391969405).

Almost surely, 2^{2638378585078} is an apocalyptic number.

2638378585078 is a deficient number, since it is larger than the sum of its proper divisors (1319189292542).

2638378585078 is a wasteful number, since it uses less digits than its factorization.

2638378585078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319189292541.

The product of its (nonzero) digits is 541900800, while the sum is 70.

The spelling of 2638378585078 in words is "two trillion, six hundred thirty-eight billion, three hundred seventy-eight million, five hundred eighty-five thousand, seventy-eight".