78255138451 has 16 divisors (see below), whose sum is σ = 90356071680. Its totient is φ = 66385144800.

The previous prime is 78255138449. The next prime is 78255138469. The reversal of 78255138451 is 15483155287.

It is a cyclic number.

It is not a de Polignac number, because 78255138451 - 2¹ = 78255138449 is a prime.

It is a super-2 number, since 2×78255138451² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78255138395 and 78255138404.

It is not an unprimeable number, because it can be changed into a prime (78255138851) 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, 1859100 + ... + 1900726.

It is an arithmetic number, because the mean of its divisors is an integer number (5647254480).

Almost surely, 2^78255138451 is an apocalyptic number.

78255138451 is a deficient number, since it is larger than the sum of its proper divisors (12100933229).

78255138451 is a wasteful number, since it uses less digits than its factorization.

78255138451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44394.

The product of its digits is 1344000, while the sum is 49.

The spelling of 78255138451 in words is "seventy-eight billion, two hundred fifty-five million, one hundred thirty-eight thousand, four hundred fifty-one".