10639557956 has 6 divisors (see below), whose sum is σ = 18619226430. Its totient is φ = 5319778976.

The previous prime is 10639557941. The next prime is 10639557979. The reversal of 10639557956 is 65975593601.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6535105600 + 4104452356 = 80840^2 + 64066^2 .

It is a super-2 number, since 2×10639557956² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1329944741 + ... + 1329944748.

It is an arithmetic number, because the mean of its divisors is an integer number (3103204405).

Almost surely, 2^10639557956 is an apocalyptic number.

It is an amenable number.

10639557956 is a deficient number, since it is larger than the sum of its proper divisors (7979668474).

10639557956 is a wasteful number, since it uses less digits than its factorization.

10639557956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659889493 (or 2659889491 counting only the distinct ones).

The product of its (nonzero) digits is 7654500, while the sum is 56.

The spelling of 10639557956 in words is "ten billion, six hundred thirty-nine million, five hundred fifty-seven thousand, nine hundred fifty-six".