1661255623208 has 16 divisors (see below), whose sum is σ = 3116409418080. Its totient is φ = 830213111728.

The previous prime is 1661255623127. The next prime is 1661255623241. The reversal of 1661255623208 is 8023265521661.

It is a super-2 number, since 2×1661255623208² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51820460 + ... + 51852507.

It is an arithmetic number, because the mean of its divisors is an integer number (194775588630).

Almost surely, 2^{1661255623208} is an apocalyptic number.

It is an amenable number.

1661255623208 is a deficient number, since it is larger than the sum of its proper divisors (1455153794872).

1661255623208 is a wasteful number, since it uses less digits than its factorization.

1661255623208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103674976 (or 103674972 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 1661255623208 in words is "one trillion, six hundred sixty-one billion, two hundred fifty-five million, six hundred twenty-three thousand, two hundred eight".