78291984451 has 2 divisors, whose sum is σ = 78291984452. Its totient is φ = 78291984450.

The previous prime is 78291984431. The next prime is 78291984457. The reversal of 78291984451 is 15448919287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78291984451 - 2¹¹ = 78291982403 is a prime.

It is a super-2 number, since 2×78291984451² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78291984457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39145992225 + 39145992226.

It is an arithmetic number, because the mean of its divisors is an integer number (39145992226).

Almost surely, 2^78291984451 is an apocalyptic number.

78291984451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78291984451 is an equidigital number, since it uses as much as digits as its factorization.

78291984451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 58.

The spelling of 78291984451 in words is "seventy-eight billion, two hundred ninety-one million, nine hundred eighty-four thousand, four hundred fifty-one".