220621261063655 has 8 divisors (see below), whose sum is σ = 265089785730000. Its totient is φ = 176267493881856.

The previous prime is 220621261063649. The next prime is 220621261063657. The reversal of 220621261063655 is 556360162126022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220621261063655 - 2²⁸ = 220620992628199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220621261063657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28689366905 + ... + 28689374594.

It is an arithmetic number, because the mean of its divisors is an integer number (33136223216250).

Almost surely, 2^{220621261063655} is an apocalyptic number.

220621261063655 is a deficient number, since it is larger than the sum of its proper divisors (44468524666345).

220621261063655 is an equidigital number, since it uses as much as digits as its factorization.

220621261063655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57378742273.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 220621261063655 in words is "two hundred twenty trillion, six hundred twenty-one billion, two hundred sixty-one million, sixty-three thousand, six hundred fifty-five".