78372529451 has 2 divisors, whose sum is σ = 78372529452. Its totient is φ = 78372529450.

The previous prime is 78372529429. The next prime is 78372529531. The reversal of 78372529451 is 15492527387.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78372529451 is a prime.

It is a super-2 number, since 2×78372529451² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78372529393 and 78372529402.

It is not a weakly prime, because it can be changed into another prime (78372529421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39186264725 + 39186264726.

It is an arithmetic number, because the mean of its divisors is an integer number (39186264726).

Almost surely, 2^78372529451 is an apocalyptic number.

78372529451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78372529451 is an equidigital number, since it uses as much as digits as its factorization.

78372529451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 53.

The spelling of 78372529451 in words is "seventy-eight billion, three hundred seventy-two million, five hundred twenty-nine thousand, four hundred fifty-one".