15564021220055 has 64 divisors (see below), whose sum is σ = 24402086811648. Its totient is φ = 9240578856960.

The previous prime is 15564021220037. The next prime is 15564021220063. The reversal of 15564021220055 is 55002212046551.

It is not a de Polignac number, because 15564021220055 - 2¹² = 15564021215959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1708574 + ... + 5835003.

It is an arithmetic number, because the mean of its divisors is an integer number (381282606432).

Almost surely, 2^{15564021220055} is an apocalyptic number.

15564021220055 is a deficient number, since it is larger than the sum of its proper divisors (8838065591593).

15564021220055 is a wasteful number, since it uses less digits than its factorization.

15564021220055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7543856.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 15564021220055 in words is "fifteen trillion, five hundred sixty-four billion, twenty-one million, two hundred twenty thousand, fifty-five".