19657348078 has 4 divisors (see below), whose sum is σ = 29486022120. Its totient is φ = 9828674038.

The previous prime is 19657348043. The next prime is 19657348079. The reversal of 19657348078 is 87084375691.

19657348078 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×19657348078² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19657348079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4914337018 + ... + 4914337021.

It is an arithmetic number, because the mean of its divisors is an integer number (7371505530).

Almost surely, 2^19657348078 is an apocalyptic number.

19657348078 is a deficient number, since it is larger than the sum of its proper divisors (9828674042).

19657348078 is an equidigital number, since it uses as much as digits as its factorization.

19657348078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9828674041.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 19657348078 in words is "nineteen billion, six hundred fifty-seven million, three hundred forty-eight thousand, seventy-eight".