19787337303616 has 21 divisors (see below), whose sum is σ = 39265568078689. Its totient is φ = 9893650858624.

The previous prime is 19787337303593. The next prime is 19787337303619. The reversal of 19787337303616 is 61630373378791.

The square root of 19787337303616 is 4448296.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7953076814400 + 11834260489216 = 2820120^2 + 3440096^2 .

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19787337303619) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 35308350 + ... + 35864386.

Almost surely, 2^{19787337303616} is an apocalyptic number.

19787337303616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19787337303616 is the 4448296-th square number.

It is an amenable number.

19787337303616 is a deficient number, since it is larger than the sum of its proper divisors (19478230775073).

19787337303616 is an frugal number, since it uses more digits than its factorization.

19787337303616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112086 (or 556039 counting only the distinct ones).

The product of its (nonzero) digits is 72013536, while the sum is 64.

19787337303616 divided by its sum of digits (64) gives a square (309177145369 = 556037²).

The spelling of 19787337303616 in words is "nineteen trillion, seven hundred eighty-seven billion, three hundred thirty-seven million, three hundred three thousand, six hundred sixteen".