3751722661 has 2 divisors, whose sum is σ = 3751722662. Its totient is φ = 3751722660.

The previous prime is 3751722659. The next prime is 3751722677. The reversal of 3751722661 is 1662271573.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3455676225 + 296046436 = 58785^2 + 17206^2 .

It is a cyclic number.

It is not a de Polignac number, because 3751722661 - 2¹ = 3751722659 is a prime.

Together with 3751722659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3751722761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1875861330 + 1875861331.

It is an arithmetic number, because the mean of its divisors is an integer number (1875861331).

Almost surely, 2^3751722661 is an apocalyptic number.

It is an amenable number.

3751722661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3751722661 is an equidigital number, since it uses as much as digits as its factorization.

3751722661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 3751722661 is about 61251.3074227808. The cubic root of 3751722661 is about 1553.8541147027.

The spelling of 3751722661 in words is "three billion, seven hundred fifty-one million, seven hundred twenty-two thousand, six hundred sixty-one".