78425465567138 has 4 divisors (see below), whose sum is σ = 117638198350710. Its totient is φ = 39212732783568.

The previous prime is 78425465567107. The next prime is 78425465567209. The reversal of 78425465567138 is 83176556452487.

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

It can be written as a sum of positive squares in only one way, i.e., 76612330605409 + 1813134961729 = 8752847^2 + 1346527^2 .

It is a super-2 number, since 2×78425465567138² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19606366391783 + ... + 19606366391786.

Almost surely, 2^{78425465567138} is an apocalyptic number.

78425465567138 is a deficient number, since it is larger than the sum of its proper divisors (39212732783572).

78425465567138 is a wasteful number, since it uses less digits than its factorization.

78425465567138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39212732783571.

The product of its digits is 1354752000, while the sum is 71.

The spelling of 78425465567138 in words is "seventy-eight trillion, four hundred twenty-five billion, four hundred sixty-five million, five hundred sixty-seven thousand, one hundred thirty-eight".