1220202345564 has 72 divisors (see below), whose sum is σ = 3167986309488. Its totient is φ = 395713347840.

The previous prime is 1220202345547. The next prime is 1220202345581. The reversal of 1220202345564 is 4655432020221.

1220202345564 is a `hidden beast` number, since 12 + 2 + 0 + 20 + 23 + 45 + 564 = 666.

It is an interprime number because it is at equal distance from previous prime (1220202345547) and next prime (1220202345581).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27844879 + ... + 27888665.

It is an arithmetic number, because the mean of its divisors is an integer number (43999809854).

Almost surely, 2^{1220202345564} is an apocalyptic number.

It is an amenable number.

1220202345564 is an abundant number, since it is smaller than the sum of its proper divisors (1947783963924).

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

1220202345564 is a wasteful number, since it uses less digits than its factorization.

1220202345564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64755 (or 64750 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 1220202345564 its reverse (4655432020221), we get a palindrome (5875634365785).

The spelling of 1220202345564 in words is "one trillion, two hundred twenty billion, two hundred two million, three hundred forty-five thousand, five hundred sixty-four".