3729718661 has 2 divisors, whose sum is σ = 3729718662. Its totient is φ = 3729718660.

The previous prime is 3729718633. The next prime is 3729718667. The reversal of 3729718661 is 1668179273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3461086561 + 268632100 = 58831^2 + 16390^2 .

It is a cyclic number.

It is not a de Polignac number, because 3729718661 - 2¹⁸ = 3729456517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3729718667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1864859330 + 1864859331.

It is an arithmetic number, because the mean of its divisors is an integer number (1864859331).

Almost surely, 2^3729718661 is an apocalyptic number.

It is an amenable number.

3729718661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3729718661 is an equidigital number, since it uses as much as digits as its factorization.

3729718661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 3729718661 is about 61071.4226213865. The cubic root of 3729718661 is about 1550.8103512946.

The spelling of 3729718661 in words is "three billion, seven hundred twenty-nine million, seven hundred eighteen thousand, six hundred sixty-one".