78945424551 has 240 divisors, whose sum is σ = 152451288000. Its totient is φ = 39797194752.

The previous prime is 78945424541. The next prime is 78945424559. The reversal of 78945424551 is 15542454987.

78945424551 is a `hidden beast` number, since 7 + 8 + 9 + 4 + 542 + 45 + 51 = 666.

It is not a de Polignac number, because 78945424551 - 2⁹ = 78945424039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78945424559) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 175824775 + ... + 175825223.

It is an arithmetic number, because the mean of its divisors is an integer number (635213700).

Almost surely, 2^78945424551 is an apocalyptic number.

78945424551 is a deficient number, since it is larger than the sum of its proper divisors (73505863449).

78945424551 is a wasteful number, since it uses less digits than its factorization.

78945424551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 542 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 78945424551 in words is "seventy-eight billion, nine hundred forty-five million, four hundred twenty-four thousand, five hundred fifty-one".