19152257818 has 4 divisors (see below), whose sum is σ = 28728386730. Its totient is φ = 9576128908.

The previous prime is 19152257737. The next prime is 19152257819. The reversal of 19152257818 is 81875225191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81875225191 = 4919 ⋅16644689.

It can be written as a sum of positive squares in only one way, i.e., 19097305249 + 54952569 = 138193^2 + 7413^2 .

It is a super-2 number, since 2×19152257818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19152257819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4788064453 + ... + 4788064456.

Almost surely, 2^19152257818 is an apocalyptic number.

19152257818 is a deficient number, since it is larger than the sum of its proper divisors (9576128912).

19152257818 is an equidigital number, since it uses as much as digits as its factorization.

19152257818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9576128911.

The product of its digits is 403200, while the sum is 49.

The spelling of 19152257818 in words is "nineteen billion, one hundred fifty-two million, two hundred fifty-seven thousand, eight hundred eighteen".