1620444251100 has 72 divisors (see below), whose sum is σ = 4699069240320. Its totient is φ = 431142994880.

The previous prime is 1620444251087. The next prime is 1620444251113. The reversal of 1620444251100 is 11524440261.

It is an interprime number because it is at equal distance from previous prime (1620444251087) and next prime (1620444251113).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5963580 + ... + 6229379.

It is an arithmetic number, because the mean of its divisors is an integer number (65264850560).

Almost surely, 2^{1620444251100} is an apocalyptic number.

1620444251100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620444251100 is an abundant number, since it is smaller than the sum of its proper divisors (3078624989220).

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

1620444251100 is a wasteful number, since it uses less digits than its factorization.

1620444251100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12193419 (or 12193412 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 1620444251100 its reverse (11524440261), we get a palindrome (1631968691361).

It can be divided in two parts, 162044 and 4251100, that added together give a palindrome (4413144).

The spelling of 1620444251100 in words is "one trillion, six hundred twenty billion, four hundred forty-four million, two hundred fifty-one thousand, one hundred".