7707125721666 has 96 divisors (see below), whose sum is σ = 18297432014400. Its totient is φ = 2157306480000.

The previous prime is 7707125721649. The next prime is 7707125721671. The reversal of 7707125721666 is 6661275217077.

It is a super-2 number, since 2×7707125721666² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3645360 + ... + 5357508.

It is an arithmetic number, because the mean of its divisors is an integer number (190598250150).

Almost surely, 2^{7707125721666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7707125721666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9148716007200).

7707125721666 is an abundant number, since it is smaller than the sum of its proper divisors (10590306292734).

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

7707125721666 is a wasteful number, since it uses less digits than its factorization.

7707125721666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712480 (or 1712473 counting only the distinct ones).

The product of its (nonzero) digits is 10372320, while the sum is 57.

The spelling of 7707125721666 in words is "seven trillion, seven hundred seven billion, one hundred twenty-five million, seven hundred twenty-one thousand, six hundred sixty-six".