78909978453 has 8 divisors (see below), whose sum is σ = 105247377600. Its totient is φ = 52589615808.

The previous prime is 78909978449. The next prime is 78909978503. The reversal of 78909978453 is 35487990987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78909978453 - 2² = 78909978449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78909978253) 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, 4248313 + ... + 4266846.

It is an arithmetic number, because the mean of its divisors is an integer number (13155922200).

Almost surely, 2^78909978453 is an apocalyptic number.

It is an amenable number.

78909978453 is a deficient number, since it is larger than the sum of its proper divisors (26337399147).

78909978453 is a wasteful number, since it uses less digits than its factorization.

78909978453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8518251.

The product of its (nonzero) digits is 137168640, while the sum is 69.

The spelling of 78909978453 in words is "seventy-eight billion, nine hundred nine million, nine hundred seventy-eight thousand, four hundred fifty-three".