78212425401 has 36 divisors (see below), whose sum is σ = 124422332580. Its totient is φ = 47308008000.

The previous prime is 78212425399. The next prime is 78212425427. The reversal of 78212425401 is 10452421287.

78212425401 is a `hidden beast` number, since 7 + 8 + 2 + 1 + 242 + 5 + 401 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 70622531001 + 7589894400 = 265749^2 + 87120^2 .

It is not a de Polignac number, because 78212425401 - 2¹ = 78212425399 is a prime.

It is a super-2 number, since 2×78212425401² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78212425471) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 483751 + ... + 624851.

It is an arithmetic number, because the mean of its divisors is an integer number (3456175905).

Almost surely, 2^78212425401 is an apocalyptic number.

It is an amenable number.

78212425401 is a deficient number, since it is larger than the sum of its proper divisors (46209907179).

78212425401 is a wasteful number, since it uses less digits than its factorization.

78212425401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141638 (or 141624 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

Adding to 78212425401 its reverse (10452421287), we get a palindrome (88664846688).

The spelling of 78212425401 in words is "seventy-eight billion, two hundred twelve million, four hundred twenty-five thousand, four hundred one".