78378750493 has 4 divisors (see below), whose sum is σ = 79072367868. Its totient is φ = 77685133120.

The previous prime is 78378750491. The next prime is 78378750511. The reversal of 78378750493 is 39405787387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 570111129 + 77808639364 = 23877^2 + 278942^2 .

It is a cyclic number.

It is not a de Polignac number, because 78378750493 - 2¹ = 78378750491 is a prime.

It is a super-2 number, since 2×78378750493² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78378750491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346808518 + ... + 346808743.

It is an arithmetic number, because the mean of its divisors is an integer number (19768091967).

Almost surely, 2^78378750493 is an apocalyptic number.

It is an amenable number.

78378750493 is a deficient number, since it is larger than the sum of its proper divisors (693617375).

78378750493 is a wasteful number, since it uses less digits than its factorization.

78378750493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693617374.

The product of its (nonzero) digits is 35562240, while the sum is 61.

The spelling of 78378750493 in words is "seventy-eight billion, three hundred seventy-eight million, seven hundred fifty thousand, four hundred ninety-three".