78213725532251 has 8 divisors (see below), whose sum is σ = 78289812879984. Its totient is φ = 78137658960480.

The previous prime is 78213725532211. The next prime is 78213725532253. The reversal of 78213725532251 is 15223552731287.

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 78213725532251 - 2¹⁴ = 78213725515867 is a prime.

It is a super-2 number, since 2×78213725532251² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78213725532193 and 78213725532202.

It is not an unprimeable number, because it can be changed into a prime (78213725532253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2344241 + ... + 12724893.

It is an arithmetic number, because the mean of its divisors is an integer number (9786226609998).

Almost surely, 2^{78213725532251} is an apocalyptic number.

78213725532251 is a deficient number, since it is larger than the sum of its proper divisors (76087347733).

78213725532251 is a wasteful number, since it uses less digits than its factorization.

78213725532251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10387981.

The product of its digits is 7056000, while the sum is 53.

The spelling of 78213725532251 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred twenty-five million, five hundred thirty-two thousand, two hundred fifty-one".