15665853085672 has 8 divisors (see below), whose sum is σ = 29373474535650. Its totient is φ = 7832926542832.

The previous prime is 15665853085633. The next prime is 15665853085711. The reversal of 15665853085672 is 27658035856651.

It is an interprime number because it is at equal distance from previous prime (15665853085633) and next prime (15665853085711).

It can be written as a sum of positive squares in only one way, i.e., 15195292756996 + 470560328676 = 3898114^2 + 685974^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 15665853085598 and 15665853085607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979115817847 + ... + 979115817862.

Almost surely, 2^{15665853085672} is an apocalyptic number.

It is an amenable number.

15665853085672 is a deficient number, since it is larger than the sum of its proper divisors (13707621449978).

15665853085672 is a wasteful number, since it uses less digits than its factorization.

15665853085672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958231635715 (or 1958231635711 counting only the distinct ones).

The product of its (nonzero) digits is 362880000, while the sum is 67.

The spelling of 15665853085672 in words is "fifteen trillion, six hundred sixty-five billion, eight hundred fifty-three million, eighty-five thousand, six hundred seventy-two".