245642123018 has 4 divisors (see below), whose sum is σ = 368463184530. Its totient is φ = 122821061508.

The previous prime is 245642122993. The next prime is 245642123047. The reversal of 245642123018 is 810321246542.

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

It can be written as a sum of positive squares in only one way, i.e., 232519733209 + 13122389809 = 482203^2 + 114553^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61410530753 + ... + 61410530756.

Almost surely, 2^245642123018 is an apocalyptic number.

245642123018 is a deficient number, since it is larger than the sum of its proper divisors (122821061512).

245642123018 is a wasteful number, since it uses less digits than its factorization.

245642123018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122821061511.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 245642123018 in words is "two hundred forty-five billion, six hundred forty-two million, one hundred twenty-three thousand, eighteen".