16378725493 has 4 divisors (see below), whose sum is σ = 17638627468. Its totient is φ = 15118823520.

The previous prime is 16378725437. The next prime is 16378725511. The reversal of 16378725493 is 39452787361.

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 1558828324 + 14819897169 = 39482^2 + 121737^2 .

It is a cyclic number.

It is not a de Polignac number, because 16378725493 - 2¹³ = 16378717301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16378725793) 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, 629950968 + ... + 629950993.

It is an arithmetic number, because the mean of its divisors is an integer number (4409656867).

Almost surely, 2^16378725493 is an apocalyptic number.

16378725493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16378725493 is a deficient number, since it is larger than the sum of its proper divisors (1259901975).

16378725493 is a wasteful number, since it uses less digits than its factorization.

16378725493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259901974.

The product of its digits is 7620480, while the sum is 55.

The spelling of 16378725493 in words is "sixteen billion, three hundred seventy-eight million, seven hundred twenty-five thousand, four hundred ninety-three".