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331665661 is a prime number
BaseRepresentation
bin10011110001001…
…101000011111101
3212010002100202101
4103301031003331
51134401300121
652524425101
711135053165
oct2361150375
9763070671
10331665661
11160242358
12930a8191
1353936c92
14320975a5
151e1b6491
hex13c4d0fd

331665661 has 2 divisors, whose sum is σ = 331665662. Its totient is φ = 331665660.

The previous prime is 331665647. The next prime is 331665671. The reversal of 331665661 is 166566133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194072761 + 137592900 = 13931^2 + 11730^2 .

It is a cyclic number.

It is not a de Polignac number, because 331665661 - 217 = 331534589 is a prime.

It is a super-2 number, since 2×3316656612 = 220004221373133842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 331665661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331665671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165832830 + 165832831.

It is an arithmetic number, because the mean of its divisors is an integer number (165832831).

Almost surely, 2331665661 is an apocalyptic number.

It is an amenable number.

331665661 is a deficient number, since it is larger than the sum of its proper divisors (1).

331665661 is an equidigital number, since it uses as much as digits as its factorization.

331665661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 37.

The square root of 331665661 is about 18211.6902290809. The cubic root of 331665661 is about 692.2030412302.

The spelling of 331665661 in words is "three hundred thirty-one million, six hundred sixty-five thousand, six hundred sixty-one".