1026721605736 has 8 divisors (see below), whose sum is σ = 1925103010770. Its totient is φ = 513360802864.

The previous prime is 1026721605683. The next prime is 1026721605737. The reversal of 1026721605736 is 6375061276201.

It can be written as a sum of positive squares in only one way, i.e., 933360803236 + 93360802500 = 966106^2 + 305550^2 .

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

It is a super-4 number, since 4×1026721605736⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1026721605737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64170100351 + ... + 64170100366.

Almost surely, 2^{1026721605736} is an apocalyptic number.

It is an amenable number.

1026721605736 is a deficient number, since it is larger than the sum of its proper divisors (898381405034).

1026721605736 is a wasteful number, since it uses less digits than its factorization.

1026721605736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128340200723 (or 128340200719 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 1026721605736 in words is "one trillion, twenty-six billion, seven hundred twenty-one million, six hundred five thousand, seven hundred thirty-six".