253661223566 has 32 divisors (see below), whose sum is σ = 408220365600. Its totient is φ = 117846144000.

The previous prime is 253661223553. The next prime is 253661223577. The reversal of 253661223566 is 665322166352.

It is a self number, because there is not a number n which added to its sum of digits gives 253661223566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6023030 + ... + 6064998.

It is an arithmetic number, because the mean of its divisors is an integer number (12756886425).

Almost surely, 2^253661223566 is an apocalyptic number.

253661223566 is a deficient number, since it is larger than the sum of its proper divisors (154559142034).

253661223566 is a wasteful number, since it uses less digits than its factorization.

253661223566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45044.

The product of its digits is 2332800, while the sum is 47.

The spelling of 253661223566 in words is "two hundred fifty-three billion, six hundred sixty-one million, two hundred twenty-three thousand, five hundred sixty-six".