1620220361520 has 40 divisors (see below), whose sum is σ = 5022683121456. Its totient is φ = 432058763008.

The previous prime is 1620220361471. The next prime is 1620220361561. The reversal of 1620220361520 is 251630220261.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1620220361520² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3375458847 + ... + 3375459326.

Almost surely, 2^{1620220361520} is an apocalyptic number.

1620220361520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620220361520 is an abundant number, since it is smaller than the sum of its proper divisors (3402462759936).

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

1620220361520 is a wasteful number, since it uses less digits than its factorization.

1620220361520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750918189 (or 6750918183 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 1620220361520 its reverse (251630220261), we get a palindrome (1871850581781).

The spelling of 1620220361520 in words is "one trillion, six hundred twenty billion, two hundred twenty million, three hundred sixty-one thousand, five hundred twenty".