78494301521 has 16 divisors (see below), whose sum is σ = 80809545024. Its totient is φ = 76211513664.

The previous prime is 78494301511. The next prime is 78494301547. The reversal of 78494301521 is 12510349487.

It is not a de Polignac number, because 78494301521 - 2¹⁴ = 78494285137 is a prime.

It is a super-2 number, since 2×78494301521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78494301511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5647046 + ... + 5660928.

It is an arithmetic number, because the mean of its divisors is an integer number (5050596564).

Almost surely, 2^78494301521 is an apocalyptic number.

It is an amenable number.

78494301521 is a deficient number, since it is larger than the sum of its proper divisors (2315243503).

78494301521 is a wasteful number, since it uses less digits than its factorization.

78494301521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15040.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 78494301521 in words is "seventy-eight billion, four hundred ninety-four million, three hundred one thousand, five hundred twenty-one".