243663354601020 has 72 divisors (see below), whose sum is σ = 739115184893904. Its totient is φ = 64976630009088.

The previous prime is 243663354601013. The next prime is 243663354601027. The reversal of 243663354601020 is 20106453366342.

243663354601020 is a `hidden beast` number, since 2 + 4 + 3 + 6 + 6 + 3 + 35 + 4 + 601 + 0 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (243663354601013) and next prime (243663354601027).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243663354601027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43751347 + ... + 49005173.

It is an arithmetic number, because the mean of its divisors is an integer number (10265488679082).

Almost surely, 2^{243663354601020} is an apocalyptic number.

243663354601020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243663354601020 is an abundant number, since it is smaller than the sum of its proper divisors (495451830292884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243663354601020 is a wasteful number, since it uses less digits than its factorization.

243663354601020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5511499 (or 5511494 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 45.

The spelling of 243663354601020 in words is "two hundred forty-three trillion, six hundred sixty-three billion, three hundred fifty-four million, six hundred one thousand, twenty".