1207664176661 has 4 divisors (see below), whose sum is σ = 1237119400524. Its totient is φ = 1178208952800.

The previous prime is 1207664176651. The next prime is 1207664176703. The reversal of 1207664176661 is 1666714667021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 585884615761 + 621779560900 = 765431^2 + 788530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1207664176661 - 2⁶ = 1207664176597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1207664176651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14727611870 + ... + 14727611951.

It is an arithmetic number, because the mean of its divisors is an integer number (309279850131).

Almost surely, 2^{1207664176661} is an apocalyptic number.

It is an amenable number.

1207664176661 is a deficient number, since it is larger than the sum of its proper divisors (29455223863).

1207664176661 is an equidigital number, since it uses as much as digits as its factorization.

1207664176661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29455223862.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 1207664176661 in words is "one trillion, two hundred seven billion, six hundred sixty-four million, one hundred seventy-six thousand, six hundred sixty-one".