243515356401 has 4 divisors (see below), whose sum is σ = 324687141872. Its totient is φ = 162343570932.

The previous prime is 243515356367. The next prime is 243515356523. The reversal of 243515356401 is 104653515342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-243515356401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243515356401.

It is not an unprimeable number, because it can be changed into a prime (243515356901) 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, 40585892731 + ... + 40585892736.

It is an arithmetic number, because the mean of its divisors is an integer number (81171785468).

Almost surely, 2^243515356401 is an apocalyptic number.

It is an amenable number.

243515356401 is a deficient number, since it is larger than the sum of its proper divisors (81171785471).

243515356401 is an equidigital number, since it uses as much as digits as its factorization.

243515356401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81171785470.

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 243515356401 in words is "two hundred forty-three billion, five hundred fifteen million, three hundred fifty-six thousand, four hundred one".