139649311963561 has 45 divisors (see below), whose sum is σ = 148246446434263. Its totient is φ = 131550528692000.

The previous prime is 139649311963517. The next prime is 139649311963573. The reversal of 139649311963561 is 165369113946931.

The square root of 139649311963561 is 11817331.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 26815629781161 + 112833682182400 = 5178381^2 + 10622320^2 .

It is not a de Polignac number, because 139649311963561 - 2¹¹ = 139649311961513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139649311963961) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 556371760686 + ... + 556371760936.

Almost surely, 2^{139649311963561} is an apocalyptic number.

139649311963561 is the 11817331-st square number.

139649311963561 is the 5908666-th centered octagonal number.

It is an amenable number.

139649311963561 is a deficient number, since it is larger than the sum of its proper divisors (8597134470702).

139649311963561 is an frugal number, since it uses more digits than its factorization.

139649311963561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 363 counting only the distinct ones).

The product of its digits is 85030560, while the sum is 67.

The spelling of 139649311963561 in words is "one hundred thirty-nine trillion, six hundred forty-nine billion, three hundred eleven million, nine hundred sixty-three thousand, five hundred sixty-one".