7781332720172 has 48 divisors (see below), whose sum is σ = 14874744044160. Its totient is φ = 3532334332800.

The previous prime is 7781332720157. The next prime is 7781332720181. The reversal of 7781332720172 is 2710272331877.

It is a self number, because there is not a number n which added to its sum of digits gives 7781332720172.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419718479 + ... + 419737017.

It is an arithmetic number, because the mean of its divisors is an integer number (309890500920).

Almost surely, 2^{7781332720172} is an apocalyptic number.

It is an amenable number.

7781332720172 is a deficient number, since it is larger than the sum of its proper divisors (7093411323988).

7781332720172 is a wasteful number, since it uses less digits than its factorization.

7781332720172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30542 (or 30540 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 50.

The spelling of 7781332720172 in words is "seven trillion, seven hundred eighty-one billion, three hundred thirty-two million, seven hundred twenty thousand, one hundred seventy-two".