3717457661 has 2 divisors, whose sum is σ = 3717457662. Its totient is φ = 3717457660.

The previous prime is 3717457637. The next prime is 3717457687. The reversal of 3717457661 is 1667547173.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2326615225 + 1390842436 = 48235^2 + 37294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3717457661 is a prime.

It is a super-2 number, since 2×3717457661² = 27638982922655181842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3717457631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1858728830 + 1858728831.

It is an arithmetic number, because the mean of its divisors is an integer number (1858728831).

Almost surely, 2^3717457661 is an apocalyptic number.

It is an amenable number.

3717457661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3717457661 is an equidigital number, since it uses as much as digits as its factorization.

3717457661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740880, while the sum is 47.

The square root of 3717457661 is about 60970.9575207738. The cubic root of 3717457661 is about 1549.1091184380.

The spelling of 3717457661 in words is "three billion, seven hundred seventeen million, four hundred fifty-seven thousand, six hundred sixty-one".