10387956661 has 4 divisors (see below), whose sum is σ = 10423410732. Its totient is φ = 10352502592.

The previous prime is 10387956617. The next prime is 10387956673. The reversal of 10387956661 is 16665978301.

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 9614783025 + 773173636 = 98055^2 + 27806^2 .

It is a cyclic number.

It is not a de Polignac number, because 10387956661 - 2¹⁵ = 10387923893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10387956599 and 10387956608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10387956461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17726596 + ... + 17727181.

It is an arithmetic number, because the mean of its divisors is an integer number (2605852683).

Almost surely, 2^10387956661 is an apocalyptic number.

It is an amenable number.

10387956661 is a deficient number, since it is larger than the sum of its proper divisors (35454071).

10387956661 is an equidigital number, since it uses as much as digits as its factorization.

10387956661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35454070.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 10387956661 in words is "ten billion, three hundred eighty-seven million, nine hundred fifty-six thousand, six hundred sixty-one".