39661625741 has 2 divisors, whose sum is σ = 39661625742. Its totient is φ = 39661625740.

The previous prime is 39661625687. The next prime is 39661625749. The reversal of 39661625741 is 14752616693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21606060100 + 18055565641 = 146990^2 + 134371^2 .

It is a cyclic number.

It is not a de Polignac number, because 39661625741 - 2¹⁴ = 39661609357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39661625741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39661625749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19830812870 + 19830812871.

It is an arithmetic number, because the mean of its divisors is an integer number (19830812871).

Almost surely, 2^39661625741 is an apocalyptic number.

It is an amenable number.

39661625741 is a deficient number, since it is larger than the sum of its proper divisors (1).

39661625741 is an equidigital number, since it uses as much as digits as its factorization.

39661625741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The spelling of 39661625741 in words is "thirty-nine billion, six hundred sixty-one million, six hundred twenty-five thousand, seven hundred forty-one".