78238041637251 has 8 divisors (see below), whose sum is σ = 104393366560080. Its totient is φ = 52120705569632.

The previous prime is 78238041637229. The next prime is 78238041637291. The reversal of 78238041637251 is 15273614083287.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78238041637251 - 2⁶ = 78238041637187 is a prime.

It is a super-2 number, since 2×78238041637251² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78238041637191 and 78238041637200.

It is not an unprimeable number, because it can be changed into a prime (78238041637201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9497208996 + ... + 9497217233.

It is an arithmetic number, because the mean of its divisors is an integer number (13049170820010).

Almost surely, 2^{78238041637251} is an apocalyptic number.

78238041637251 is a deficient number, since it is larger than the sum of its proper divisors (26155324922829).

78238041637251 is a wasteful number, since it uses less digits than its factorization.

78238041637251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18994427605.

The product of its (nonzero) digits is 13547520, while the sum is 57.

The spelling of 78238041637251 in words is "seventy-eight trillion, two hundred thirty-eight billion, forty-one million, six hundred thirty-seven thousand, two hundred fifty-one".