242005556205666 has 64 divisors (see below), whose sum is σ = 586683301138560. Its totient is φ = 73334621422080.

The previous prime is 242005556205577. The next prime is 242005556205691. The reversal of 242005556205666 is 666502655500242.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120403210 + ... + 122396666.

It is an arithmetic number, because the mean of its divisors is an integer number (9166926580290).

Almost surely, 2^{242005556205666} is an apocalyptic number.

242005556205666 is an abundant number, since it is smaller than the sum of its proper divisors (344677744932894).

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

242005556205666 is a wasteful number, since it uses less digits than its factorization.

242005556205666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197856 (or 2197850 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 54.

The spelling of 242005556205666 in words is "two hundred forty-two trillion, five billion, five hundred fifty-six million, two hundred five thousand, six hundred sixty-six".