1620715145560 has 128 divisors (see below), whose sum is σ = 4184311219200. Its totient is φ = 553443770880.

The previous prime is 1620715145507. The next prime is 1620715145573. The reversal of 1620715145560 is 655415170261.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 74017974 + ... + 74039866.

It is an arithmetic number, because the mean of its divisors is an integer number (32689931400).

Almost surely, 2^{1620715145560} is an apocalyptic number.

1620715145560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620715145560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2092155609600).

1620715145560 is an abundant number, since it is smaller than the sum of its proper divisors (2563596073640).

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

1620715145560 is a wasteful number, since it uses less digits than its factorization.

1620715145560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22961 (or 22957 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 1620715145560 in words is "one trillion, six hundred twenty billion, seven hundred fifteen million, one hundred forty-five thousand, five hundred sixty".