16621157540240 has 160 divisors (see below), whose sum is σ = 42581527822080. Its totient is φ = 5983255296000.

The previous prime is 16621157540219. The next prime is 16621157540261. The reversal of 16621157540240 is 4204575112661.

It is an interprime number because it is at equal distance from previous prime (16621157540219) and next prime (16621157540261).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 16621157540191 and 16621157540200.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 785599742 + ... + 785620898.

It is an arithmetic number, because the mean of its divisors is an integer number (266134548888).

Almost surely, 2^{16621157540240} is an apocalyptic number.

16621157540240 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 16621157540240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21290763911040).

16621157540240 is an abundant number, since it is smaller than the sum of its proper divisors (25960370281840).

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

16621157540240 is a wasteful number, since it uses less digits than its factorization.

16621157540240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30121 (or 30115 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 16621157540240 in words is "sixteen trillion, six hundred twenty-one billion, one hundred fifty-seven million, five hundred forty thousand, two hundred forty".