1620022345531 has 4 divisors (see below), whose sum is σ = 1644201783592. Its totient is φ = 1595842907472.

The previous prime is 1620022345523. The next prime is 1620022345559. The reversal of 1620022345531 is 1355432200261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1620022345531 - 2³ = 1620022345523 is a prime.

It is a super-2 number, since 2×1620022345531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620022345511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12089718930 + ... + 12089719063.

It is an arithmetic number, because the mean of its divisors is an integer number (411050445898).

Almost surely, 2^{1620022345531} is an apocalyptic number.

1620022345531 is a deficient number, since it is larger than the sum of its proper divisors (24179438061).

1620022345531 is an equidigital number, since it uses as much as digits as its factorization.

1620022345531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24179438060.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 1620022345531 its reverse (1355432200261), we get a palindrome (2975454545792).

The spelling of 1620022345531 in words is "one trillion, six hundred twenty billion, twenty-two million, three hundred forty-five thousand, five hundred thirty-one".