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661000199 is a prime number
BaseRepresentation
bin100111011001100…
…001000000000111
31201001210021210212
4213121201000013
52323204001244
6145331310035
722244260166
oct4731410007
91631707725
10661000199
1130a132262
1216544b31b
13a6c35ba2
1463b053dd
153d06bd9e
hex27661007

661000199 has 2 divisors, whose sum is σ = 661000200. Its totient is φ = 661000198.

The previous prime is 661000169. The next prime is 661000211. The reversal of 661000199 is 991000166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661000199 - 220 = 659951623 is a prime.

It is a Chen prime.

661000199 is a strobogrammatic number because it is the same when read upside-down.

It is equal to p34335473 and since 661000199 and 34335473 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661000129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330500099 + 330500100.

It is an arithmetic number, because the mean of its divisors is an integer number (330500100).

Almost surely, 2661000199 is an apocalyptic number.

661000199 is a deficient number, since it is larger than the sum of its proper divisors (1).

661000199 is an equidigital number, since it uses as much as digits as its factorization.

661000199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 661000199 is about 25709.9241344661. The cubic root of 661000199 is about 871.0983612883.

The spelling of 661000199 in words is "six hundred sixty-one million, one hundred ninety-nine", and thus it is an aban number.