18351642401 has 2 divisors, whose sum is σ = 18351642402. Its totient is φ = 18351642400.

The previous prime is 18351642391. The next prime is 18351642457. The reversal of 18351642401 is 10424615381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15166168801 + 3185473600 = 123151^2 + 56440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18351642401 is a prime.

It is not a weakly prime, because it can be changed into another prime (18351642481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175821200 + 9175821201.

It is an arithmetic number, because the mean of its divisors is an integer number (9175821201).

Almost surely, 2^18351642401 is an apocalyptic number.

It is an amenable number.

18351642401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351642401 is an equidigital number, since it uses as much as digits as its factorization.

18351642401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 18351642401 in words is "eighteen billion, three hundred fifty-one million, six hundred forty-two thousand, four hundred one".