716121666 has 48 divisors (see below), whose sum is σ = 1758906240. Its totient is φ = 208746720.

The previous prime is 716121641. The next prime is 716121677. The reversal of 716121666 is 666121617.

It is a self number, because there is not a number n which added to its sum of digits gives 716121666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76090 + ... + 84981.

It is an arithmetic number, because the mean of its divisors is an integer number (36643880).

Almost surely, 2^716121666 is an apocalyptic number.

716121666 is an abundant number, since it is smaller than the sum of its proper divisors (1042784574).

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

716121666 is a wasteful number, since it uses less digits than its factorization.

716121666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161111 (or 161108 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 716121666 is about 26760.4496598992. The cubic root of 716121666 is about 894.6687562526.

The spelling of 716121666 in words is "seven hundred sixteen million, one hundred twenty-one thousand, six hundred sixty-six".