78381501373 has 12 divisors (see below), whose sum is σ = 91326293532. Its totient is φ = 67075229760.

The previous prime is 78381501329. The next prime is 78381501379. The reversal of 78381501373 is 37310518387.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19105321284 + 59276180089 = 138222^2 + 243467^2 .

It is not a de Polignac number, because 78381501373 - 2²¹ = 78379404221 is a prime.

It is a super-2 number, since 2×78381501373² (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 (78381501379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1266058 + ... + 1326523.

It is an arithmetic number, because the mean of its divisors is an integer number (7610524461).

Almost surely, 2^78381501373 is an apocalyptic number.

It is an amenable number.

78381501373 is a deficient number, since it is larger than the sum of its proper divisors (12944792159).

78381501373 is a wasteful number, since it uses less digits than its factorization.

78381501373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593212 (or 2593205 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 78381501373 in words is "seventy-eight billion, three hundred eighty-one million, five hundred one thousand, three hundred seventy-three".